I had and still have problems with algae as well.
The 120g tank is some 4 month old, no ammonia, nitrate or nitrite, never had.
Heavy planted, with some 15 species. Half are fast till very fast growing.
With 3 x 150w Metal halide and 2 x 80w blue light I had all kind of algae in the beginning.
Starting from Film, Spot, Fuzz algae, Hair, Tread and Stackhorn algae
After 6 weeks I decided to put fish in it, a schoal of 10 SAE and 12 shrimps (most seems to be wood shrimps, but also 1 red and some glass clear shrimps came in that packet),
WOW they cleaned up.
3 SAE died, so did many shrimps, but no more after that.
The shrimps reproduce now, in a speed I'm worried I getting too many, if that is possible.
Then I had a algae bloom, the water turned first greenish and whitish. I changed the filter to a stronger and bigger sized on, now have 800l/h instead of 600 also moved the filter inlet to the front. Does not look too nice, but creates a better flow.
3 days later the water was clean.
BUT, I still have Thread and Stackhorn algae, and no solution so far how to get rid of them. (except the removal by hand) Reduce fertilation, I read somewhere, but my iron is always arround 0.1ppm (use Ferropol on a weekly basis).
What to do? Any suggestions beside pondsnails, which, by the way, I haven't seen here anywhere?:help: