@markstrimarman - So increasing the water flow results in more growth ... not necessarily increasing the lighting. The algae must be limited by oxygen, carbon dioxide, ammonium/nitrate, phosphate and/or other nutrients/elements, and more light isn't going to help.
It's similar to a regular biofilter. Higher flowrates supply more ammonia for nitrifying bacteria to grow. Lower flowrates = smaller colonies.
That is probably whats, going on. The other might be that with a fast flow only the green hair algea, can get a grip.
I also up the flow in the drip thru scrubber, 260 GPH. With a new powerhead, as a pump. Filter floss wrapped around the intake.
It has the same lights as above. The crawfish killed a 2" cichild, so nitrate reading of 10ppm in the 30 gallon drip scrubber is invalid.
The basement 30 is on a 150 watt that is more like 40 watts, bases on the light. out put. On the larger 90 watt.
One had 50 3watt bulbs. The other had 90 one watt bulbs. My plan is to remove, and install a bunch of 660nm led. They were dirt cheap. So it's practice time.
