Use small observable portions
Offer food the fry can consume promptly. Increase frequency before increasing each portion.
Remove waste gently
Use airline tubing, a guarded siphon or careful spot cleaning. Shine a light into the waste container before discarding water to check for fry.
Match replacement water
Condition new water where required and match temperature and chemistry closely, especially in small tanks.
Change water based on evidence
Use test results, feeding level, visible waste and growth—not a universal schedule alone.
Protect the filter
Clean sponges when flow declines, but preserve biological function and avoid simultaneous deep cleaning of all media.