Fish-Only Tanks EXPLAINED (Feeding, Maintenance & Vacations)

Feeding is usually straightforward in a fish-only tank. Most fish do well on high-quality flakes or pellets, but adding frozen or live foods like brine shrimp or daphnia can boost their colour and bring out natural behaviours. The main thing is to avoid overfeeding, since leftover food quickly breaks down into waste and can crash your water quality.

Maintenance is fairly simple. Weekly or bi-weekly water changes of 20% or more are enough depending on the species and the size of fish you keep, along with routine filter cleaning depending on the type—whether you’re running sponge filters, hang-on-back filters, or canister filters. You’ll also need to clean algae off the glass and occasionally trim plants if you have them.

If you’re going on vacation, you’ve got three options: skip feeding for a few days, use an automatic feeder, or have someone check in. Skipping meals is fine for up to a week in most cases, but if you’ll be away longer, an automatic feeder or a trusted helper becomes essential.

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