I have quite a bit of shrooms under MH lighting. What I have seen is they will generally "move" around on the rock until they are happy, sometimes they have even let go of the rock to find another spot. Generally they like non-direct light. Can you put a small rock to sort of shield them some?
I agree with Blindside on the GSP, I have a TON of it in my FOWLR, and every now and then a rock or two will close up for a day or two.. One hint is GSP loves nitrates and pollution. Any change in lighting, replaced old bulbs with new, etc.?
I have a 48" dual T5 retro complete set that is still NIB and never used. Included is 2 giessman bulbs that are NIB and never fired, 1 Actinic+ and 1 pure Actinic. My co-worker commutes to Austin from SA every day, so I can make arrangements for him to take them to Austin. ----$140-----
AKA---Ace