why dont you try buying an emerald crab. just one maybe 2 in your size tank.
also you say water changes, how many gallons a week are you doing. if you have nitrates and phosphates i would be doing 20 percent a week. also how many fish do you have in your tank and try feeding them frozen food for a month. frozen food is like 85 percent water, so a lot hard to overfeed.
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