23" is too far from that light in my opinion. Is it an air cooled hood? I believe you can get to within a foot of that light and not see burning if you have it vented. 80 degrees should be fine and it's hard to get too arid. Chances are , by the looks of it, it is a strain that would be better suited to outdoor growing. Get an airstone in that water pronto! A flush couldn't hurt either. Also be careful when flushing to let your flush solution and replacement solution get up to room temp so as not to shock the roots.

Good luck!