a couple of corrections/additions I feel I need to make:
- upwards flow isn't really necessary. just low flow.
- they rely mostly on photosynthesis so lighting has to be bright; food doesn't have to be daily though they will eat it and would probably enjoy daily feeding.
-sandbed depth is irrelevant. just has to be oolitic (fine grained). don't feed brine shrimp.
-sandbed must be extensive. these can be kept in standard aquariums if you plan it right. you don't need a kreisel because they are benthic.
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