I have a very nice looking encrusted I believe it’s a Fava anyway are used to have it up high on my rock with the hopes that it would just start to cover the rock but the past three days I noticed a couple of white areas along the edges and was wondering if I had it up to high and the light was burning it I’ve had it 3 1/2 maybe four weeks and last night I took it off the rock and put it down on the bottom of the tank until I figure out where I should put it