Ok, I'm a novice at these things! I have 2 Pearl Gouramis, that parts easy!! One's tummy has turned a sort of orange, he's(?????) disappeared into the floating log thing that we have and(now I may be wrong) and he seems to be blowing bubbles. Does this mean they're doing the wild thing? And if so, what do I do now? I do have a spare tank available but it's only small, 40cm/25/20. Help please!!