I wouldnt give up on GMK. Could have been a ton of things. I got mine from @SweetReefOH. Super healthy specimen. Think I got 3 polyps 6-7 months ago and probably close to 70-80 polyps now. Buy from reputable source. Try to keep as close to same par as system you get them from.
Sweet Reef has some sweet stuff I'd be on the look out next time he drops some.

