my tank has a bad alge prblem it only started when we got our 3 bronze corys i change the water every week i used a magic sponge on the inside of the tank but its back within a few days. wot am i doing wrong for this to happen?
this sounds really stupid but my boyf does the testing as he was the 1 that got shown how to read it (by colour not numbers). But when we test the water yesterday it was all perfect.