Welcome to the forums - congratulations on 40 years. I will be 29 years in a couple of months.
If it was me I would change 3 1/2 buckets of water today, tomorrow and monday and then 3 every couple of days for about 3 weeks, then you can reduce it to about twice a week.
You will be amazed how much difference this will make to a gasping fish. When you do the water changes siphon up as much gunk on the bottom as you can as this is what will cause water quality problems.
If you add some plants to your tank (like cabomba) which can also float on the surface you will find that when your fish have fry some will be saved as they will have somewhere to hide.
Further on down the track (after you have 2 or more tanks :lol: ) you will be able to put your pregnant females in another tank to drop the fry.
As for questions - there are no stupid questions, questions are what we are here for so ask away.
You will find you will get varying advice, so read all of it, think about it and then do what you feel you should do based on it. Happy fishkeeping!