Many thanks, I know - all a bit sad. Took readings anyway and got 0 ammonia and nitrite, ~20ppm nitrate, 2ppm phosphate and 6.8 ph (co2
running). Bit strange but hoping it doesn't repeat.
Tried running the LED
light with both banks on but got a PAR of 140 (1ft deep) so went back and tested with just the white light bank on (as I had been running). PAR there was 90 which was a little above the previous reading of 60 in early June... Especially as I thought the t5ho's might have started to decay a little. I'm hoping this reflects all the plants being removed near-surface and not the par meter going. So just left lighting as is.
Next week I'll clean the internal filter and might replace the pads. Also plan to try lifting the CO2
bps rate a little now it is running well.