Do shrimp or snails count as fish? lol XD
In a small tank such as this, plants are essential to keep ammonia spikes in check. Get familiar with the different types and get something floating (for shade or bedding) and something either rooted that's a stem feeder or a marimo ball. Ferts are cheep and will last a long time, but you must be careful as you will need to use VERY little. Remember to also have adequate hiding places and substrate. No rough gravel, pfs, or clown puke.
Snails and/or shrimp would do fine in a 1.5 gal tank. Bettas are a gray area here. Some say the minimum size tank for them is 2.5gal while others say 5gal is best. I normally say 3 should be the lowest you should go.
However, their bio load is low, so as long as you are willing to put in some extra work, you could get a betta. You need to consider their bio load, making sure you keep the hormones they release in the water in check with lots of pwc (so they don't end up stunted), their activity level, and how they should be properly feed.
CT will normally have more spunk (thus needing more room) while VT are usually more laid back. I couldn't comment on the other types as I don't remember, but I would think a HM would be a bad idea because their tail would take up so much space. A giant would be a bad fit too for obvious reasons.
There will be plenty of partial water changes. I would say 3 50% pwc a week should do it (maybe more in the very beginning).
Depending on size, he/she will eat 1-5 Omega One Betta Buffet pelletts a day. Keep an eye on weight as too fat or too skinny is not good on them. Plus, too fat means more poop which means more ammonia in a VERY small space. Speaking of poop, turkey basters make the best vacumes for small tanks.
And a heater is essential unless you live somewhere where his water will naturally stay within his ideal limits (what does his thermometer say?). If you can't get an adjustable one that will fit, get a small preset one with a lot of good reviews. After all, something is better than nothing at all.
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