I have been battling BGA for well over a year
I have had lots of good advice From here
I tried to go with low CO2 but within a few weeks the BGA started coming back and is now as bad as ever. We have bitten the bullet and bought a CO2 system. It is not pH controlled, I only have the CO2, regs, solenoid and a dupla diffuser.
We have started to use Tom Barr's EI index and are adding KNO3, MgSO4, KSO4 and trace elements with iron. The plants are now growing like crazy and pearling like mad (well the giant vallis anyway). We prune about 1lb of vallis a fortnight so it's definately growing much better. Only problem is the BGA is back and growing like mad too.
We are about to carry out another black out but need some advice on how to get the CO2 concentration up. It seems to be the only thing missing as far as I can tell...
1 x 30% water change per week with added Seachem Equilibrium and bicarb added to give GH 4 KH 4. Today's parameters are GH 4, KH4, NO3 5mg/l, (just about to carry out water change and add ferts) PO4 2mg/l, pH 7.6 to 7.9
Do I simply need to increase the bubble rate to get the CO2 up to 20-30ppm or am I doing something else wrong? Currently running 60-80 bpm on a 150 US gallon tank.