You only need one Nerite as they will compete with the Oto for algae. Know that Nerite won't normally eat wafers or vegetables; they need the real thing. Oto are shoaling so 6+ is a better number. Depending on your filtration you could have them with the Neons as they spend most of their time attached to the tank wall or on plants and not free swimming.
Some do fine with Betta and Neon but I've found them to be nippy. If you like them I would suggest the more peaceful Ember Tetra. Or, if you like Plakat or female Betta that's what I would get as opposed to a Betta with long fins.
Have fun finding your aquarium residents. Here's a tool which might help you along the way.
I retried with Ember Tetras and the results are as follows:
Your aquarium filtration capacity for above selected species is 67%.Help on Filtration capacity
Recommended water change schedule: 31% per week.
Your aquarium stocking level is 84%
I run two filters in my tanks. I tell myself if one conks out I always have a backup or if I need a hospital or quarantine tank I have an extra. The real reason, I think, is I always have a cycled filter at the ready if I decide to get another tank.
I looked at your filter and it is for *up to* 60L. So it's the bare minimum for your aquarium. I'd add another or get the smaller Eheim Pickup 45. Plug in both options to Aqadvisor and see what happens. Another thing to do is remove everything except the Betta and see what is your filtration capacity.
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