Thanks I'll try that.
How many more barbs should I get? Once the new tank is cycled should I put the current and new ones in at the same time?
Sorry for all the questions, but I think I should probably make a bit more of an effort than the previous owner!
A tenant who recently moved out left behind a fish tank with six fish in it. It is a small tank - I think it must be about 30 litres. There was no heating or filtration but there was an air stone. After a bit of research I think there are 3 cherry barbs and 3 plecos. I have taken responsibility...