A few months ago I moved to a new place and upgraded from a 55 with a 40 gallon sump to a 125 with an 80 gallon sump. In the old tank I never needed a heater, the tank was always 76-78 degrees, the new tank was very cold, 70-74 degrees as I messed around with stuff trying to get the temp to tolerable without a heater. A few weeks ago I finally gave up and bought a 300w heater and have kept the tank right around 78 since. The funny thing is that my calurpa bed and my L2 algae scrubber have been doing GREAT with this new tank. The calurpa has been going like mad, and the scrubber COMPLETELY fills up every week with spongy algae that is not really hair algae, but seems more like long thin strands of Ulva, but its bright green and works great. However a few weeks ago my algae scrubber slowed down to almost nothing, my calurpa is all falling down and looking sad, and my display is growning brown coating algae. Today was the first time I have cleaned out my scrubber in 2 weeks and the algae was very sad looking, mostly brown sludge and very weak. Some of the stringy green stuff was there, but not much. At first I had assumed scrubber was slowing down because I dont feed much, just a few small strips of nori a day, and I thought my display might be getting to much sun and growing the brown stuff, but now I am wondering if the heat increase is to blame for the brown stuff out competing the green ribbon algae and the calurpa. Anyone run into anything like this before? Ever noticed it having anything to do with heat changes or it happening around the dame time? My scrubber flows my entire return pump, which I figure is around 600 GPH, I have left the scrubber and the calurpa lights on 24/7 since I set this tank up in mid October. I have not made any changes besides the heater, and backing off the display lighting once the growth in the display started.