I may be a newb but I have found Astrea's to be the hardest workers in my tank. I have about 5 of them and I have only had to give one a little help once in the two months I have had them. I have a mexican turbo and he only seems to move at night and sits in the same place all day. My Ceriths work quite a bit but are much smaller than the Astrea's so not a fair comparison.
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