Great tank mate but i would personally clean out completely the area where you are putting your new cheato in.A crap algae bed that’s never functioned properly, up to this point I think the constant use of gfo and the amount of rock in the tank has helped,
Here’s what it looked like a couple of days ago before the clean
I have fresh cheato coming today, I have complete cleaned the algae bed, changing the light to a cfl bulb 140watt and 6200k running reverse cycle.
Readings last night were nitrate 2.5ppm phos 0.012ppm but I have been dosing nopox