Hi,
I'm looking for some advice. I've a 60 litre tank, its been going for some 16 weeks now. The first fish to enter were 3 guppies 10 weeks ago, then 2 1/2 weeks later I added 6 Harlequins,I then added 2 red honey gouramis about 2 weeks ago, I check my nitrate etc every week and have never...