I seem to have slime and bubble algae problem in my sump. Its taken over a small peice of marcro algae that I have taken out. However it is still on the sand in the tank and have some rather large bubbles appearing in little pockets as well. What do I need to do to fix this. I checked Phosphate levels and they are not even present in my tank. I have not fed this tank in 3 days so I do not think overfeeding in the problem, it has been set up for 3 months. pH 8.0-8.3, salinity 1.024, Ammonia 0, Nitrite 0, Nitrate 5-10 calcuim 400 PO4- 0.