can anybody help please? I put my two gouramis back in the main tank after figuring they were both males :oops: but the juvenile male swordy hassled them. One g. has developed mould, stress i guess so is in a small tank with Tonic in the water. The other fish looked off so put him in the small tank too. A couple of days later, he suddenly started turning somersaults then looked VERY drunk. I did a big water change thinking the salt (1.5 tspns to 10L) might have upset him, added more tonic and some other stress reliever. He spent the next two days slowly dying.
Does either Tonic or salt affect the ph level because it was about 6.6, when normally it is about 7.2. The other g. wasn't upset by anything.
Is there anything particularly that makes sick fish jump and splash?