They are a pain to keep but they are soo nice to look at when they are open. It is nice to have that much color when the lights go down.
Mine open at the same time every night. I do not have to tease them to open, they just now dinner is at 7 so they get ready!
I purchased a Nano cube (thanks Chaloupa) just for them. I has a couple small fish with them but not very many crabs. It also help to turn the flow off, and spot feed every head with a pipette.
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