Best kept at 78. And almost forgot, how clean is your gravel, try gravel vaccing coz at times toxic gasses release from the gravel, seen this happen too (remove him from the main tank while doing that). But if you are 100 percent sure water columns ok then no worries you can rule out this check...
Great you are doing the best you can, how’s his diet now ? You can keep his tank covered and provide him comfort for a couple days, sudden movement usually stresses a fish that’s already stressed, you can gently remove the cover and get him adopted to day night cycle in a day, it’s best to...
guppies dwell mostly on the top of the tank, if your guppy fries are there swimming on the top then you are on the right track, jus ensure they don’t get sucked up by filters and if you can spend a few bucks get a heater and keep them constantly on 81 or 82 f as they grow faster in this temp...
Mostly guppies isolate during their labor, this is only normal unless there are other problems with your water parameters, keep your tank well airated..
Quarantine him. You can pull the worm out with your hands I’ve seen people do that in several YouTube vedios mollies especially .. or get Antibiotics quickly and doze for 7 days.
Sorry to hear, get some cattapa leaves or Almond leaf as it may naturally get rid of stress. Keep the temperature stable , keep him in a dark place (you can cover your tank with a towel). How good is your filter media (good bacterial colonies will help keep fish healthy). Don’t do water changes...
Hmm then it’s not community stress, could be something else in the tank. Try keeping him in a dark place for few days & recheck the nitrate levels of that tank to ensure it’s ok. Otherwise should be fine. Happy fish keeping.
I’d suggest that you simply use a porous sponge instead of this cartridge (biological filteration) for mechanical filteration your polyester stuff I’d good to go. Ensure to place porous filter as the first thing that comes in contact with the water followed by your polyester stuff on top of that...