I've been running them since the end of August. I'd hoped they would get rid of an algae problem I was having. I've noticed that skimmer output is increased and it's darker.
The algae hasn't really decreased, in fact its increased. To be fair I haven't been as diligent as I should and the tank has been through quite a lot. My GFO is probably spent a while ago, but if the nitrate was dropping I'd have expected the algae to reduce and get cyano or something like that.
I have had some snails die - probably of old age, I've had them for years. I'm also pretty sure that my dart fish have one by one died in the rock somewhere, so that could be loading them up beyond their capacity.
Either way I haven't noticed any adverse reaction from the corals, in fact they've really started to grow since I started sanding drywall mud down there..
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