Red Gills, otherwise healthy guppies

[WObblescat]

I am having a problem with my female guppy tank, 10 gallons 5-6 months old, all my parameters are all spot on, I do weekly 50% water changes, there are 7 adult females and around 20 something fry including accidentally breed some muppies (balloon Molly female/male guppy) is it just to overloaded, the fry are really small I thought I'd have a mont, their gills are all inflamed and I can't figure out why. I did have problems in this tank like 3 months ago, but for the most part that was because of poor quality guppies from a pet store, everything has been fine for a long time, are all the fry too much?

 

[fishorama]

Well, I'm guessing your tank has too many fish to get to a "balance" point between stocking, water changes & beneficial bacteria. 7 adult guppies is pretty much it for a 10g. Add fry (20!) & enough food for all & you might be looking at 50% WCs every day or 2.
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What are your "spot on" water parameters? Red gills can be from high ammonia (anything up to or over 0.25ppm), any nitrite at all, high nitrAtes... or a few diseases.

Please tell us more, we want to help you & your fish.