This morning I woke up to find my older male guppy looking a bit sick. He is hanging around the bottom a lot, hovering in the water but not swimming around. He also looks to have a drooping and maybe slightly clamped tail. I had a guppy 3 weeks ago that had some of tese symptoms but died. I treated the whole tank first with a general tonic the waited for that to clear and then added an anti internal bacteria. Although the guppy died, the other fish were all very healthy and have been for the past 3 weeks. I also did a 45% scheduled water change last night. This guppy is also the only sick one in the tank. Any help greatly appriciated for my much loved fish!