Do you have a thermometer for the tank? I have one that stands up on the bottom of the tank. It's visible in some of my gallery pics. You can also buy floating ones, or ones that you attach to the side of your tank with a suction cup, or ones that stick on the outside of the tank. I use the stand-up thermometer inside the tank to look at for a quick reading. Once a week or so, I use a digital thermometer to verify the temperature. I've seen expensive digital thermometers on aquarium websites, but I just got my thermometer in a kitchen store. I labelled it so that it's the "fish-only" thermometer.
About the peas: I fill the fish-only glass measuring cup with about 1/2 cup of tap water, put the frozen peas in, and put in the microwave and set for 4 1/2 minutes. The water doesn't start boiling right away, but I don't bring the water to a boil without the peas. I just put the peas in and then set the cook time for 4 1/2 minutes. When the microwave beeps, I take the cup out and pour some of the hot water off, and add some bottled water from the frig to the cup. This cools the peas faster and stops the cooking so they don't become too mushy. Then when they're cool, peel the skin.
About the Epsom salt: If you've added 1/8 teaspoon of Epsom salt per gallon to try to draw out the fluid, then only replace what you remove at a water change. For your 5 gallon
QT tank, I would change a half gallon of water a day, and just put a pinch of Epsom salt into the new water. If you have an ammonia test, and the ammonia gets high, change one gallon of water a day.
About the meds, I would not use the Jungle fizz tabs with Kanaplex or Jungle Fungus Eliminator. For your male bettas, I think the Fungus Eliminator would be the best choice. For the female bettas, I would use the epsom salt to try to draw out some bloating, then do a water change of about 2 gallons and try some Kanaplex in the water. OR you could continue the epsom salt in the water if it looks like it's helping, and just soak a pinch of Kanaplex into some food and feed it that way. I wouldn't mix Kanaplex and Fungus Eliminator in any of the fish bowls or tanks.
I remember from a post above that you have conch shells in the female betta tank, right? Is this an artificial decoration from the
lfs or an actual shell from the ocean? I would be very hesitant to put something into a freshwater tank that was from the ocean. The minerals and salt content could leach into your water slowly for a long period of time. How slowly and for how long? That's hard to answer. It could be that the leached minerals would reach a dangerous level to
FW fish several years after their normal lifespan. (hope that makes sense!) Or the dissolved minerals could raise the pH or hardness rather quickly. I do not think this is the cause of your problems now, but I still wouldn't keep that shell in the tank unless it's an artificial decoration. It's too hard to tell how much it's actually leaching into the water and possibly causing stress.