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How big should a sump for a 100gl tank be?

I have a 100 gallon tank that I'm going to put corals and a few fish in. I have a fluval 404 and a bakpak protein skimmer. Am I over doing it with both of these filtration devices?

Is it ok to leave blue attinic lights on all night?

I have a 100 gallon tank with a bak pak protein skimmer and I added a fluval 404 my water is pretty clear but I think it could be clearer. I would like to know what would make my water crystal clear and if this is too much filtration for my tank and I would also like to know if using the fluval...

I have lost 2 clowns, 4 cardinals, a coral beauty, and a yellow tang. now my water has turned green and cloudy. can anyone tell me what's going on?PH, nitrate, nitrite, and ammonia are good.