I have purple finger leather coral (purple Colt).I got it from petco and the had it under a florescent (50/50) and it was doing fine so I bought it.I got it in my 5.5 tank and it was doing fine as well so I moved it to mt 20 gallon so It will have more light and it got worse.My water seems pretty fine.Its one Of my favorite corals. Can any one nurse it back to health for me?