i found a small spot (size of end of a fingertip) of BGA this afternoon! I removed it with my fingers
the eheim aquaball came and i've directed the flow towards that spot
co2 is cranked up - drop checker at furthest point in tank from output showing green / yellow ish
dosed TPN+ yesterday (used weekly dose divided by 7 as intend to dose daily), measure nitrates after lights off tonight and got 20ppm (API kit) so have not dosed tonight - intend to wait until nitrates drop to 10ppm then dose - sound sensible?
thanks again for all the help
I don't understand why you'd wait for Nitrate to drop to 10ppm before dosing again. You'll never know if any of the other nutrients from TPN+ have been used up? Just keep dosing to the schedule, each day, how ever much mls. If you don't have enough ferts in there algae will come back.
Oh, and ditch the test kits, they're unreliable. Read what's going on in your tank as a sign of nutrient levels. Algae = something's not right.