Most of the "chemicals" that are sold online to treat blue green algae (bga) are actually antibiotics, which shouldn't be used to treat blue green algae.
If the bga falls out of the gravel cleaner and lands back in the tank, it will not die. It continues to grow. Use a net to scoop the stuff up ad remove it from the tank. Then gravel clean the substrate. Do this every day for a couple of weeks.
Reduce dry food going into the tank.
Increase water movement around the bottom.
If worse comes to worst, take the tank apart and wash it all out. Hose the sand out and clean it up and start again.
I don't know if a UV steriliser will make any difference to bga because it isn't in the water. The only things affected by a UV steriliser are microscopic things that pass through the UV unit. The bga is on the substrate and won't be passing through the UV unit.
If the bga falls out of the gravel cleaner and lands back in the tank, it will not die. It continues to grow. Use a net to scoop the stuff up ad remove it from the tank. Then gravel clean the substrate. Do this every day for a couple of weeks.
Reduce dry food going into the tank.
Increase water movement around the bottom.
If worse comes to worst, take the tank apart and wash it all out. Hose the sand out and clean it up and start again.
I don't know if a UV steriliser will make any difference to bga because it isn't in the water. The only things affected by a UV steriliser are microscopic things that pass through the UV unit. The bga is on the substrate and won't be passing through the UV unit.