A planted aquarium is one system with two sets of needs, and a split record hides the connections between them. Fertiliser changes plant growth, plant growth changes the water, and the water is where the fish live. Noting plant care and fish care in the same entry, on the same day, in the same fixed shape is what lets you read cause and effect across weeks instead of guessing why the tank changed.
One Entry Shape for the Whole Tank
Use these fields, in this order, for every entry: date, liquid fertiliser amount, root tablet and its position, pruning or planting done, light period, water change amount, fish feeding and behaviour note. A worked entry reads: Date: 2025-04-12. Liquid fertiliser amount: full measured dose for this tank, given after the water change. Root tablet and its position: one tablet pushed deep beside the large rooted plant at the left end. Pruning or planting done: stem plants trimmed by a third, cuttings replanted at the back. Light period: eight hours, on the usual timer setting. Water change amount: about a quarter of the tank, conditioned and temperature-matched. Fish feeding and behaviour note: normal ration taken eagerly, all fish out in open water afterwards. Every field earns its place: the tablet position matters because a tablet placed near a hungry rooted plant feeds growth, while one forgotten in open gravel feeds algae instead.
Writing Plant Care So It Can Be Read Later
Record plant work on the day it happens, while your hands still remember it. Name the plant group and the end of the tank rather than writing plants done, because growth responses show up plant by plant, not across the whole scape at once. Note a new plant's arrival in the pruning or planting field on its first day, with where it went, so a later die-back can be traced to that plant's settling-in rather than blamed on the fertiliser. When you change the light period, write the new period in full rather than longer lights, since a future reader, even a future you, cannot reconstruct an amount from a comparison. The same applies to fertiliser: write the measured amount given, and write nil on a week when a dose was deliberately skipped, so a gap in the calendar reads as a decision instead of a forgotten entry.
Reading the Combined Record
The payoff comes when something shifts. Algae appearing on glass and slow-growing leaves two weeks after a fertiliser increase reads very differently from algae appearing after a light period was lengthened, and the combined calendar shows which change came first. Fish hanging near the surface on a morning after heavy pruning can be read against the plant mass removed the day before, which had been producing and sheltering in that corner. Growth stalls, melting leaves, and fish behaviour all become questions the record can answer, because nothing about the plant side was happening off the page. Review the calendar monthly, looking down the fertiliser and light fields together, and change only one thing at a time so the next month of entries shows what that single change did.
Handing the Tank to Someone Else
A combined record is also a genuinely useful handover to leave a sitter, because it shows the whole weekly rhythm in one place: which day the fertiliser follows the water change, which plants are due a trim, and how the fish normally behave after each job. Mark clearly which entries the sitter should repeat and which were one-off corrections to leave alone. Held in KinsLe, a Pet Passport keeps this planted calendar beside the fish profiles it belongs to, ready for a sitter, a shop assistant, or your own review months later.