3,895 answers about fish & aquatics
A healthy aquarium is a balanced one — water chemistry, filtration, stocking and feeding all work together, and most fish problems start with the water. This page gathers the fish and aquatics library of KinsLe Answers in one place, organized by topic for freshwater and saltwater keepers alike. Every answer is original, written by KinsLe, and tied to a real KinsLe feature.
297 answers in Young Pets — page 10 of 13
In the first days after hatching, pond goldfish fry barely look alive: they hang from plants and the pond walls absorbing their yolk sacs, and they need no food from you at all. Once they let go and swim level, usually within the first week, they begin hunting microscopic food, and your job becomes offering tiny live…
Plan for multiplication, not for one litter: a female guppy delivers broods roughly monthly, keeps producing after a single mating, and her daughters start breeding young, so decide now how many tanks you can run, how you will separate the sexes, and where juveniles will go. Line up homes in advance — a shop that…
Set up three things before the birth: a small nursery tank or a heavily planted corner with a gentle sponge filter already cycled, dense cover such as moss and floating plants where newborns can hide, and first foods on hand — powdered fry food or finely crushed flake, with baby brine shrimp or microworms if you can…
Fry grow unevenly mainly because the biggest babies reach food first, eat more, and then grow faster still, while smaller siblings get chased from feeding spots and burn energy avoiding their own brothers and sisters. Genetics and early health play a part, but access is the lever you control: scatter food across…
Match the grow-out tank's temperature and water to the fry tank first, using water from the original tank or water prepared the same way, and let its sponge filter run cycled before moving day. Catch fry gently with a soft fine net or, better for the smallest, a cup or turkey baster approach that moves them in water…
Each week, note the fry count you can see, the size of the largest and smallest, what foods they have graduated to, and when colour or fin shape first shows. Add behaviour notes — who feeds boldly, who hides, any nipped fins — plus the tank facts that explain growth: temperature, water changes done, and any losses…
All three culture well at home and cover different mouth sizes: infusoria is the first food for fry too small to hunt, vinegar eels suit tiny fry that feed near the surface, and microworms feed slightly larger babies that pick food from the water and bottom. Start cultures before the fry arrive, because each takes…
In the first month a healthy baby betta grows from a near-transparent speck that hangs at the surface into a free-swimming fry taking tiny live foods and making short, strengthening swims. By the second month the body deepens, fins lengthen, and the first hints of colour and sex differences appear. Across the third…
Newborn livebearer fry are born ready to eat, and they need food small enough for tiny mouths offered several times a day: finely crushed flake rubbed to powder, powdered fry food, baby brine shrimp, and microworms all suit them. Live foods that wriggle trigger the strongest feeding response, while powder and crushed…
Start by separating the sexes so the supply stops growing, then raise the current fry in a grow-out tank until they are big enough to sex and move on. Independent fish shops often take healthy juveniles for store credit, aquarist clubs and local groups rehome common livebearers quickly, and healthy youngsters make…
The clearest signs are a belly that has squared off at the front when viewed from above or the side, a dark gravid spot that looks larger and closer to the vent, and a female who separates herself from the group. She may hover in one corner, hide among plants, refuse food she normally takes, or make small shivering…
For most home livebearer tanks, dense plant cover is the kinder default, because a breeding trap confines the mother in a small bare box where she can panic, refuse food, and sometimes release fry early. Floating plants, moss clumps, and thick stem growth give newborns instant hiding places while the mother stays calm…
Adjust feeding gradually when fry move from live to prepared foods: offer the new food first while they are hungriest, follow it with a smaller live portion, and shift the ratio over several days until prepared food carries most of each meal. Crush or grade the prepared food to the size they already manage, and keep…
Change a fry tank's water little and often: a small portion daily, or a slightly larger one every other day, works far better than a big weekly change, because fry are stressed by swings and their heavy feeding fouls small volumes quickly. Siphon from the bottom with airline tubing to lift waste and uneaten food, and…
Test a fry tank far more often than an adult tank: check ammonia and nitrite every day or two in the first weeks, and nitrate and pH a couple of times a week, because small water volume, heavy feeding, and delicate fish leave almost no margin when conditions drift. A mature adult tank, by contrast, usually needs only…
Tell male and female guppy fry apart by watching for a sequence of signs rather than one moment: females develop a dark gravid spot near the vent and keep a rounded fan-shaped anal fin, while males stay slimmer, begin showing colour earlier, and their anal fin narrows into the pointed gonopodium as they mature. All…
Stop adults eating newborn fry by breaking the chase at three points: give fry dense cover the instant they are born, keep the adults genuinely well fed around the birth, and separate either the mother before she drops or the fry soon after, depending on the species. Fine-leaved plants and moss thickets reaching the…
A simple fry-rearing tank is a small bare-bottomed tank with a mature sponge filter, a heater if the species needs warmth, gentle light, and a clump of plants or moss for cover — nothing more elaborate. Fill it with water from the parents' tank so conditions match what the fry already know, and run the sponge filter…
Raise your lone survivor where it already feels safe if you can: it survived in those plants because cover and microscopic food were both there, so improve that spot with fine foods delivered nearby rather than rushing to move it. If tankmates still hunt it, shift it gently in a cup of tank water to a small rearing…
Protect cichlid eggs and wrigglers at night by removing opportunity rather than relying on the parents alone: give the spawning site tight cover, keep the tank in real darkness instead of lit viewing, and move known egg-eaters — especially catfish active after lights-out — out of the tank before spawning if you can. A…
Prevent intake accidents by covering every filter intake before fry appear: slide a pre-filter sponge over the strainer, or wrap it in fine mesh secured so no gap opens at the top. A sponge guard is the safest option for the smallest fry because it spreads suction across a wide surface instead of concentrating it at…
A tank that looks clean to you can still feed baby shrimp well, because the algae and biofilm they graze are mostly invisible films on glass, wood, stones, and leaf surfaces rather than green growth you can spot. Help them by keeping some surfaces unscraped, leaving driftwood and dried leaves in place, and resisting…
Fry grow fastest on three things working together: frequent small meals of protein-rich food they can actually fit in their mouths, very clean water maintained with small regular changes, and enough swimming space that crowding never stalls them. Feed several tiny meals a day rather than one large one, vary live and…
Grade fry by gently netting a sample into a shallow white tray of tank water, where size differences show clearly, then sort the batch into two or three groups of similar-sized fish rather than chasing exact measurements. Work when the fry are a few weeks old and again whenever a few noticeably larger mouths start…
Can't find your question? Ask it here. We answer reader questions in KinsLe Answers — and we'll email you when yours is published.
KinsLe is launching soon — and the waitlist hears the date first. Join for launch updates and first access when the app opens.
We email you about the launch. Unsubscribe anytime.