I'm biting and purchasing a 3.0 for my 50 hex and not sure which size would be best for viewing, the 15-24" model is what fits my lid but I'm not sure if that's what would be best for viewing. I was thinking of purchasing a 24-34" model and rigging it the way I've done shop lights previously but I'm unsure which would be better for my tank. I'm concerned the larger light may be too much for my tank. The lowest-down plants are jungle/leopard val, Crypt wendtii, and an Amazon sword and the tank is 31" tall.