with the lighting i have right now they might not look like yours. but that is the next thing i plan on is a new light. so that is what they are? giant green people eaters?they are under 2x39w t5's, actinic & 17k daylight and 2x15w t8's, fresh/salt bulbs.
Mine are getting more green in the center as time goes on.. i have 4x24w T5HO on my 20GL.