Catfish Breathing Very Hard

[fishRfriends]

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Tank size: 75 US gal
pH: 7.0 (seems really low?)
ammonia: 0
nitrite:0
nitrate: 10
kH: dont know
gH: dont know
tank temp: 80 degrees (no heater either!)

Fish Symptoms (include full description including lesion, color, location, fish behavior):
Ive posted similar to this but now a new fish is showing very different symptoms. Our loach has been slowly withering away, but he is still hanging on strong and eating, but mostly he just lays sidewas on the tops of the plants. The new fish, our pictus catfish, has been pretty bloated the last few days so we cut down on feeding and fed some peas to see if that helped. It didnt. He is still very very bloated and now he is breathing extremely heavy, you can see his gills flaring and his mouth gasping Some of the other fish seem, to me, to be bloated, but its my moms tank and she insists they were always like that and are just fat (dont know if thats relevant though)

Volume and Frequency of water changes:
30% weekly

Chemical Additives or Media in your tank:
?

Tank inhabitants:
See sig

Recent additions to your tank (living or decoration):
None

Exposure to chemicals:
We've been feeding them an anti bacterial medicated fish food because we thought it was likely a bacterial thing, but nothing changed.

 

[WILDER]

Sounds like a bacterial infection, when fish lay on things, or on there sides its bacterial infection, and sorry once they do this and heavy breath they are dying.
I would issolate the fish if you can, even if you have to put him in a container at the top of the tank, i would add a bacterial med for the rest, good luck.