I have 2 acros, but I'm pretty new to SPS. One is a bali green slimer which is doing great, the other is a mille which isn't so great. It only extends polyps at night. The mille was bleached when I bought it because the store had a pump malfunction which electrocuted the tank. It lost its color as a result, but had good polyp extension in the store and it was cheap, so I bought it. I have several other SPS which are all doing great: pocillopora, stylophora, hydnophora and montipora capricornus. None of them were affected by the magnesium overdose.
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