I have this red looking algae growing all over my plants and back glass of my 150 gallon. I have pressurized c02 and dose ferts every other day. I just added 15 algae eating shrimp but they dont seem to be interested in the red algae, just the green stuff. I was wondering if i need to up the amount of c02 i inject. The c02 indicator stays a lime green all the time and sometimes it wants to turn a little yellow. I'm afraid to add more c02 becasue this might make my discus fight for O2. I use to leave my lights on for 12 hours and a couple weeks ago i bumped it down to 9 hours a day. This red stuff still seems to keep growing. I even quit dosing ferts for a couple weeks and still it grows on everything. I have a uv sterilizer but that just keeps the free floating algae from appearing and does not help the stuff that is growing on my plants and driftwood. Any suggestions or ideas would be greatly appreciated.