I am using the 24" T5 Dual-HO light fixture for my 25Gal Tank .. I tested by turned on both bulbs in same time for 2 days around 8 hours per day. However, almost all of my java fern leaves and java moss are turned into brown (looks like burned) ... Is that the reason caused that problem ? Now I only turn on 1 bulb from that light .. should I use regular light fixture back ?