Welcome to the forum @SinfulBetta94 I am glad to hear that dispite some bad experiences that you are still pushing forward in the hobby. All your bettas are beautiful!
I think that should be enough ammonia to start it up but adding a bit more wouldn’t hurt. Semi regularly ghost feeding will help keep the beneficial bacteria alive.
I completely agree with @xXInkedPhoenixX that ph is too low for the fish you keep. Adding crushed coral would help keep the ph higher. As for the rams horn snails feeding less and removing some adults whenever you have a chance will help keep their population under control.
I’m glad you decided to find a good fit for the platy and that it worked out. Sorry for the fish you lost along the way. @ScottieB has a good point that some of those losses could have happened anyway.
A quick update on my aquariums. Claire is doing well and the fungus on her fin has almost completely cleared up. She has started to eat some bloodworms which is great. I purchased a 75 to replace my 55 a few days ago. I haven't yet set it up though. I also found an albino krib for my male so hopefully I can get them to breed soon. I also sold some guppies and plants on aquabid and will be shipping them out on monday. Picture time!