Everyone's making a lot of effort to help. Should really get a handle on the tank parameters first if one decides to go high tech with co2 otherwise it looks like you are trying to run a marathon while wearing diapers and baby booties. very ambitious but doomed to fail.
strips dont test for ammonia
subsyrate is fluval stratnum
Specifics about any fertilizer used seachem flourish
Specifics about any other additive used none
co2 is at about 1 to 1.5 bps
the strip was kinda hard to read it might have been 0 i just did a water change a week ago i should prolly do another 20 % in a few days. the block for nitrites on the strip is almost the same for 0 as it is for 20 but the fish dont seem to be stressed or anything and the cory cat thats in there seems fine if i can get a clear pic of it ill post it
Strip tests aren't reliable, unfortunately. You'll want to pick up a liquid test kit to determine more accurate numbers.
Do you use a drop checker to help estimate the amount of CO2 in your tank? While I doubt CO2 is the reason you're having trouble, that will give you a better idea of your CO2 saturation. Bubbles Per Second isn't really a measurement to be used. Your 1.5BPS may be equivalent to my 5BPS. No way to know because pressures are different, cylinder temperatures are different, equipment is different, etc.
Water quality is probably your issue, as others have mentioned. You won't know until you can get your hands on a liquid test kit.
As said, strips are not reliable at all. I doubt your nitrites are 20 or it's likely everything would be dead but it's best to know for sure; a liquid test kit is your best bet. Also a 7.9 gal is barely enough for two mollies alone (which are messy fish) let alone everything else in there, so you're overstocked and possibly not fully cycled which is causing problems. Upgrading to a 20-30 gal would be ideal and allow you to have a full shoal of corys.