Why can't I grow plants in my 21/24 inch deep aquariums, previously I had a 120 gallon 5' tank, 24 inches deep, I couldn't get any plants to grow in it besides Anubis and Java fern, any stem plants will eventually rot off at the gravel. Substrate is dime and smaller gravel. Light is a 48 inch nicrew, suspended about 5 inches above the tanks. My new tank is a 130 gallon waterbox, this time I added additional free standing grow lights, and the anubius looks like the leaves are burnt, suddenly turned brown, too bright of lights i'm guessing. at 21 inches deep, with fluval stratum under the same gravel, ordered pogostemus octo, water sprite and Brazillan penny wort, added root tabs to the pots, put the pots into the gravel, been a few weeks, the penny wort has rotted off, the water sprite is not looking good, losing sections every few days, pogostemus hanging in there. Do I have too much light or not enough? No ammonia or nitrites, nitrates are at about 50 ppm, use easy green once a week also. Anyone have any suggestions?? sorry but the photo downloads upside down, even if I rotate it