okay heres the thing. i got bigger tanks i got water tester i got everything needed.
First i notice the fish was dying. i lost one in the beginning and i didnt think anything of it cause its fresh off the bag. so 2 weeks pass 3 died, then i got mad and said **** this and moved them into the 45 gallon i had cycle for about 2 weeks. i used old water from my 160 to fill it up, let it run did a water changed, and tested the water. everything was on key. so i moved them in there since my original plan was to move them in there. then when i fed them in the morning got home from going out. i noticed 2 more died. then i was like wtf is going on, so i decide since my 12 gallon had gravel, i thought the gravel was dirty so i cleared it all out and moved them back into the 12 with the same procedure, cup of water every 5-10 mins they were in a 5 gallon so when it filled half way i slowly net them and put them back in. they were fine until today i saw another one die and i was like what is going on. water in that tank been fine i didnt do a major water change until today which was a 40-50% water change with prime. i always do 20-30% on all my tanks
note - i did not use any vinegar or any additives beside prime. i heard a suggestion of vinegar but didnt try it.
so far they are doing good with fishncash idea, but i didnt put any coppersafe since they are not safe with plants in there. i got a big driftwood with little holes for their hide out, bout 4 anubias 1 amazon swords 3 pvc piping cut to about 3 - 5 inches.
water test on it was fine, all i wonder is since a 12 gallon is so small is it possible for it to go in a mini cycle when doing water change, if so should i have little bags of ceramic rings in the tank just to keep bacteria efficient enough for the tank not to go into a mini cycle. i housed many fish in the 12 gallon and didnt lose a fish until these indo's came. i had 10 pbass in the same tank before. then i had 4 ntts with 11 loaches before.