Guppies gills are red?

Question

I have 4 guppies and all of their gills are red and they were not red before. I looked on the internet and it said i needed to turn my air up in the tank. I did that last night and the red went away, but it back again.

Any suggestions to what this is?

Answer 1

First check your ammonia and nitrite levels and make sure they're at 0 ppm.  

It could also be a parasite infection, like ich or gill flukes-which you won't see, can only tell for sure by doing a gill scraping and looking under a microscope.  If the water quality checks out ok, or if there's nitrites present, try adding some aquarium salt-1 tablespoon per 5 US gallons, dissolve first in a bowl with some dechlorinated water, and see if that helps.