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I had 3 tanks that are fishless. Past-tense because I added a red-headed goby to the 20 tall.
The other two tanks are 3 gallons (almost a year old) and 1.5 (2+ years old) gallons.
Both are very stable, even with infrequent feedings a few times a week. I see almost no adverse effects (zoanthid growth appears stunted) from my almost shamefully few water changes (ie: once every few months).
The amphipods, mysid shrimps, and bristleworm populations are doing very well since there are no natural predators. A ball of cheato helps with nutrient export though I rarely have to trim it.
A couple hermits and some nassarius snails are the only critters (not counting pods/worms) in both tanks. Oh, Theres a sexy shrimp in the 1.5 also. There used to be three but two of them didnt make it though the heat wave last summer.
Hope this helps.
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