Easy Numbers for a Tough Fish
Convict cichlids thrive from about 72 to 80 degrees Fahrenheit, roughly 22 to 27 degrees Celsius, and accept a pH from about 6.5 to 8.0. Central American waters gave them a constitution that handles ordinary tap water in most homes without adjustment, and they breed readily across that whole span. A keeper can therefore spend less effort on chemistry than with almost any other common aquarium fish, and more on the factor that actually decides success with convicts: space and territory. Getting the water right is a single afternoon's work; managing what a bonded pair does to a tank is the ongoing project.
Temperature and the Breeding Trigger
Warmth toward the upper end of the range, combined with regular water changes, encourages convicts to spawn, and they need little encouragement. A female develops an orange wash on her belly, the pair selects a cave or flat stone, cleans it, and lays eggs she fans while the male patrols. Temperature also affects how quickly eggs develop, but the practical point for most keepers is the opposite of the usual one: you may not want breeding speed. A slightly cooler, mid-range setup can slow the cycle a little, although no setting switches off a healthy pair for long, so plan for fry before you need the plan.
pH Tolerance and Honest Priorities
Convicts in hard, alkaline water and convicts in softer, mildly acidic water both grow, colour, and breed well, provided the chemistry is stable and the water is clean. Their real water-quality enemy is the waste load created by their own habits: digging redistributes substrate, feeding is enthusiastic, and a guarding pair may be fed extra by an anxious keeper. Ammonia and rising waste in a neglected tank harm convicts far sooner than a pH of 7.8 ever will. Test waste levels more faithfully than pH with this species, change water on schedule, and let a stable reading anywhere in the span stand without correction.
Territory Planning Around the Cave
A pair claims the area around its chosen cave and expands that claim when fry become free-swimming, herding them in a cloud and driving off fish several times their size. In a community tank this is the moment tank mates get injured, pressed into top corners with nowhere left to retreat. The kind options are a species tank for the pair, or a large aquarium with rockwork that creates genuinely separate territories and enough length for other fish to live beyond the boundary. A single convict kept without a partner is notably calmer, and for many home tanks that is the sensible stocking decision the water charts never mention.
Reading Behaviour in a Breeding Tank
Healthy convicts in suitable water are busy: digging pits, moving small stones, displaying with flared gills to each other, and eating with enthusiasm. A convict that stops digging and sits darkened in a cave may be guarding eggs, which is normal, or may be ill, and the difference shows in appetite and in whether the partner behaves normally. Test temperature and pH if both fish go quiet, and involve an aquatic veterinarian when a fish stops eating, breathes hard, or shows wounds that are not healing, bringing notes on the pair's breeding stage, since treatment options change around eggs and fry.
Shared Notes for a Pair Everyone Watches
Convict tanks attract family attention, and mixed messages, one person feeding the guarding pair extra while another changes water early, can unsettle a breeding setup. Writing down the cave location, when eggs were first noticed, and who feeds keeps the household consistent. Through KinsLe, Family Sharing lets everyone at home see the convicts' profile and care information together, so the pair's routine stays the same whoever is on duty.