Hello all. I've been reading daily for several months and finally "assembled the picture" to get my full pass. Last July I returned to the hobby after a decade long hiatus (military - finally got my own house as my wife and I approach retirement).I am currently running 3 tanks; a 65 Gallon with Silver Dollars and a school of tiger barbs, 60 Gallon mbuna tank, and a 20L planted with neons and dwarf gouramis. The 60 and 65 both run two Penguin 350s (likely to be replaced with (4) AC110s), and the 20L runs a AC70 throttled all the way down. I am thinking of building a tank-top refugium for the 65 to help with nitrates. I plan to use a piece of vinyl gutter, placed upside down behind the light bar, filled with very coarse gravel, and fed by a powerhead. Pothos will be my plant of choice....easily found locally and known to be effective at nitrate removal.Hoping this setup works well and I will do something similar on the 60 Gallon Mbuna tank.Just wondering if anyone has done anything similar? I plan to make the water flow as slow as possible, and if necessary place a wall mounted fluorescent above the tank to take care of the pothos.Water changes aren't to much of a problem...but I am currently doing 50%/week to keep the Nitrates below 40PPM, and I expect that it will become difficult once the fish are fully grown.If anyone has any experience with this, I would be very glad to hear.Danny