Well I have some in my sump but I have had it since I set the system up so I haven't really had any experiance without it. My plan now is to remove it with a vac and see what happens if there are any issues I'm just going to put some back in. I'll keep you guys posted as to My experiance with it. I've seen a few people claim that it is good stuff but maybe they are just tricking them selves.
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I think bare bottom is the better way to go. Less mess to worry about. If you have the proper amount of live sand and rock up in your tank, a good skimmer and macro algae in the refugium, things should be fine.