First you need to find out where the fuel is coming from that feeds the algae, test tank and top off water for nitrates, phosphates. Are you using tap or ro
What are you feeding the tank?
Yank it off the LR
for now and scrubbing the lr
can help for a quick fix. You need to find the source, so you can get rid of the nutrients feeding the algae.
Some info about the tank may help????????