I'm a HUGE believer in refugium and naturalistic aquariums... so there's like ~70 sprouted mangroves in this refugium, 200 pounds of live rock, and two-basketball size chaeto......
it supports a single 15 gallon reef/frag tank... hahahaha......
My mangroves are very bent, yours look very straight, I don't know if I have red mangroves or not, you don't worry about there being too little nutrients in the tank? Where do you get your mangroves? What should I do? how much light do they need?