In a nano/pico, IME you really can’t beat 100% water changes weekly, or maybe twice weekly in your case. Mix a vat of about about 10 gallons in your case so you can keep changing from the same vat. Before you change a water take a turkey baster to everything and spray it off. If you don’t have any actual live sand/rock in the tank, I recommend introducing some, the natural fauna/flora will help create an ecosystem and help prevent any one species to take over and run rampant. Towards that end, also make sure to feed, that helps create the ecosystem. A lot of people try to feed less to starve algae, but it usually won’t work, everything else will starve first most often. If you don’t have snails In there, try adding three trochus, they eat most anything, even diatoms.
Oh, and don’t vacuum the gravel! You’re disrupting/destroying the ecocystem in the sand, and that ecosystem is going to prevent things like nuisance outbreaks. Don’t touch the sand, don’t stir it or anything. But add a few Florida ceriths for some activity. I’ve also noticed it seems like you don’t have sand, but more like crushed coral. This is not good for marine aquariums, the grain size is too large for a natural ecosystem to form. I recommend adding live sand with a grain size average of ~.125mm.
In summary:
- 100% water changes 1-2x a week, use NSW if you can get it.
- Keep your pH high, ~8.4 (obviously adjust slowly, no more than .1/hr)
- Add ~2-3 trochus and florida cerith snails
- If you don’t see pods, introduce some
- Feed daily (in a pico, broadcast feeding is fine) I recommend feeding a variety of sizes
- Don’t vacuum the sand
- Add some live rock and/or sand for increased biodiversity
The above is the strategy I’ve used for 25+ years. I feed very heavily (1 cubic inch of a variety of powdered foods per 200 liters per day, plus liquid plankton, phytoplankton, and liquid nutrients) and always use 100% live rock/sand. This has always created an ecosystem in my aquariums of all kinds of creatures (varieties of pods, tubeworms, coral [yes, new corals appearing on the rocks], tunicates, feather dusters, oysters, sponges, stuff I can’t identify, and lots of varieties of coralline and macro) plus what I add to assist (a variety of snails and a few small hermits). IMO most ecosystem imbalance problems (which is what’s occurring here) come from 1) not starting a tank with live rock/sand 2) not feeding enough and enough variety of sizes/types.
Hope this perspective helps
Oh, and don’t vacuum the gravel! You’re disrupting/destroying the ecocystem in the sand, and that ecosystem is going to prevent things like nuisance outbreaks. Don’t touch the sand, don’t stir it or anything. But add a few Florida ceriths for some activity. I’ve also noticed it seems like you don’t have sand, but more like crushed coral. This is not good for marine aquariums, the grain size is too large for a natural ecosystem to form. I recommend adding live sand with a grain size average of ~.125mm.
In summary:
- 100% water changes 1-2x a week, use NSW if you can get it.
- Keep your pH high, ~8.4 (obviously adjust slowly, no more than .1/hr)
- Add ~2-3 trochus and florida cerith snails
- If you don’t see pods, introduce some
- Feed daily (in a pico, broadcast feeding is fine) I recommend feeding a variety of sizes
- Don’t vacuum the sand
- Add some live rock and/or sand for increased biodiversity
The above is the strategy I’ve used for 25+ years. I feed very heavily (1 cubic inch of a variety of powdered foods per 200 liters per day, plus liquid plankton, phytoplankton, and liquid nutrients) and always use 100% live rock/sand. This has always created an ecosystem in my aquariums of all kinds of creatures (varieties of pods, tubeworms, coral [yes, new corals appearing on the rocks], tunicates, feather dusters, oysters, sponges, stuff I can’t identify, and lots of varieties of coralline and macro) plus what I add to assist (a variety of snails and a few small hermits). IMO most ecosystem imbalance problems (which is what’s occurring here) come from 1) not starting a tank with live rock/sand 2) not feeding enough and enough variety of sizes/types.
Hope this perspective helps

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