doh! I just found out that I haven't been running my carbon for a couple of weeks now. Yikes! I guess I unplugged it a couple of weeks ago while rewiring things around and forgot to plug it back in. The carbon is pitch black and it is hard to see under the dark stand so I just assumed it was running. Anyway, hope this was it. Carbon is supposed to help remove unwanted chemicals I think? Like for example the nasty chemicals that corals use during chemical warefare? So maybe without the carbon stripping it out it was building up in my tank and started affecting some of them.
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