- You don't need to use stress coat/aquarium salt that often.
I would SAVE that for real emergencies. Also check in your kitchen to see if you have any NON-IODIZED salt.
- Aquarium salts is just is plain salt without all the extra filler.
I think by adding salt/stress coat, it'll just stress out your new rescue.
I applaud you for buying fish from Walmart & PSmart if they're showing so many signs of illness. I personally would not RISK it.
However if you cannot resist bringing a potentially sick fish home, then you DEFINITELY have to quarantine & make sure you don't cross contaminate any of the equipment you use on your fishies.
Your 10gallon tank looks GREAT in my opinion. It has all these betta type toys & decorations that my tank in cycle is missing.
I have maybe 1 betta type cave & the fake plants were just extras I had laying around.
Good luck with the new one.
- I can see why you want to go the divided tank route instead of the sorority after ordeal with your betta crew.
Another note = vinegar is a good sanitizer if it's NOT diluted. That's why I prefer to use bleach instead. I use a 2%-5% solution of bleach in the kitchen, but I haven't used it on any of the active tanks/decorations.
I'm pretty sure for vinegar, you will need to use 100% vinegar. White vinegar should be the cheapest.
I save the bleach for sever cases of disease.