Looking to buy a metal halide fixture from fishneedit for a 29gal to replace my compact florsent. Should I go for the 150watt or 70watt. The plants in the tank need moderate to high lighting. I do EI dosing plus trace along ith iron. I use pressureized CO2. I can't seem to bring out the red colors in a few of the plants using my current lighting. I've heard the 150 is a decent fixture for the money but would it be overkill on a 29gal but I guess I could always raise the fixture higher if algae break out occurs. Any suggestions?