One of the algae tanks is not growing well so I have cross pumped water from a tank that is doing exceptionally well twice to try and kick start it. In the morning I will stir and check it. If it is still not great, I will set up the above ground pool, pump the water out and collect the algae from the bottom of the tank. I will filter it then restart the tank with the biomass. I’m picking up a barrel to use for rainwater collection which will fix what I suspect happened: roof debris from the initial fill are sitting in the bottom, fouling the water.