So I have a fish tank with the following water parameters:
gH: 80 mg/L
kH: 60 mg/L
Nitrates: ~ 5 ppm
The tank last September and since then has kept these same water parameters very steadily over the better part of the last year.
After the cycle, I started buying live plants which in my view adds to the overall look and feel of the tank.
And then Cyanobacteria (a.k.a. BGA) appeared. I have been fighting this nuisance for the last 6 months and many scrubs and water changes later I am still having problem getting rid of it. The stuff has literally killed off all my live plants and I've even removed ALL the gravel from my tank at some point and boiled it for 15 minutes before adding it back in. I've tried the blackout way for 3 full days to no avail.
This is now 1 month later. My tank is still void of plants because I do not want to add live plants knowing that the BGA is still present in the water. I do a 50% water change twice a week, giving the tank and the filter and filter media a thorough scrub every time in tank water. This fish tank is probably the cleanest tank out there and while there is little visual signs of cyanobacteria, still the BGA remains present in the water. The tank is in the basement where natural light is non-existent so this is not the issue.
So on to my question before I start ranting some more and bore everyone to death:
I have read that having a level of nitrates around 20 ppm may actually help in eliminating the BGA.
- Is this true?
- And if so, how does one get to have nitrates levels that high by performing weekly water changes?
I feel like I am missing some info here because based on Byron's article about planted tanks, I was doing everything right and still this @#% BGA persists... so something is clearly amiss...