Put new lights in 90G, 2 actinic 2 white. Xenia starts to shrink. Any ideas? Not related to light but something else? Pulsed like mad for weeks. Nitrates go to 0 and Xenia looks poor. Have read something about them liking Nitrates as they do denitrify.
???
It really does not matter as long as you provide adequate filtration and vitamins/supplements. The more equipment you have to extract organic nutrients, the more your tank can accommodate.