Your LEDs will work, but like you said they will have to be turned down to maybe around 30% full power. RO water is always better as its cleaner but in a freshwater setup, tap water with conditioner works well and is convenient. You would want to get smaller Powerheads, over 1,000gph is way to strong for most freahwater fish as they come from clamer environments. As for filtration, you can run your sump as a wet/dry filtration system (that's the one with bio balls). If you have a refugium, take in out as its not needed.
MetalArm3
Posted via Mobile Device
MetalArm3
Posted via Mobile Device