How can I lower the pH value (South American and Southeast Asian fish)?
How can I lower the pH value? I keep hatchetfish, Cardinal tetras, yellow gouramis and Siamese algae eaters in my aquarium, and I wanted to add a few Otocinclus as well.
you can lower the pH value with sera super peat (blackpeat granulate) or sera pH-minus.
At the moment, the pH value is 8, or is that not too high at all?
It is indeed too high for the fish!
If yes, what should it be like?
A pH value around 6.5 would be ideal in this case.
How many specimens of Otocinclus affinis should I keep?
The midget sucker catfish do well in groups of approximately 8 - 10 specimens; but they are very likely not Otocinclus affinis - this species is extremely rarely imported, and virtually all fish sold under this name in the trade are from other species.
Dr. Bodo Schnell