my 2 plates just dead, but octo elegance torch bubble are fine... dont know what happen to them, i placed it on the bottom with a 250 MH , back 3 weeks ago they still looking good... and also orange plate is looking bad right now, would this from No3 is high?? because i just checked my no3 couple of days ago and its red then any one have a tip to lower the nitrate, i just get the nitrate remover stuff from seachem and put it for 3 days, also put algone in to the sump, changing water 300 littes already my tank is about 500 littes