Put the montis low, all those acros will be fine with those par levels from MH as long as you acclimate them.Tim, I just tested my par on my 16" tall tank. I'm running 400w Radiums with 4 t5's and you can just imagine the PAR. I'm getting anywhere from 420-590 at the top of the rocks to 390-460 in the middle. LOL talk about PAR overload. What do you think? Will the acros adapt? I have a green slimer, Strawberry shortcake, superman monti, Oregon tort, Tyree undata, and a few unnamed ones. The Giesemann Spectra is already over 15" above the water line. Let me know what you think. Thanks.