Depending on the Brain you intend to keep, flavides can be kept in reasonably low light, but some ofthe other brains need more light....
Answering your question to my previous post, Yes the PVC is on the glass bottom and supports the rock off the bottom. I don't have a Deep Sand Bed in my tank but I do in my refugium so the rock in my tank is about an inch to an inch and a half off the bottom. The aragonite does come up to the bottom of the rock in most cases but if anything does decide to burrow, they won't get crushed by the rock settling.
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