I may be wrong but your tank is already overstocked. Do you know about the nitrogen cycle. The betta is not a good community fish, and should be kept in a tank of its own. How long has this tank been up and running and what are your water parameters, before i advise on fish.
Sorry about that, I didn't update my info. I gave away all my guppies to friends and moved my betta to a 2.5 gallon tank. My pleco is going back to the pet shop soon. im thinking about gettings like having this tank stocked with 8 zebra danios and a oto cat since they dont grow too big. Can you give me some algae eaters also so I can choose between the oto cat or ect.. This tank has been up for about 3 months already by the way.
i have galaxy rasboras....they are def smaller than the harlies. they are prob and inch or so. plus they are not as sensitive as neons. they remind me of a stary night sky with all the speckles on them and they have a touch of orange on the tips of their fins. pretty/cute fish! i have four, with two more in Q. with four, they don't school a ton. i'm hoping six will do the trick.
yeah i'd say galaxy rasboras, or endler's livebearers....both stay about one inch. i can't really think of more off the top of my head.......you're pretty limited with one inch. but both those fish are pretty.
I've been researching nano fish and I've found ember tetras, dwarf emerald rasboras, chili rasboras and dwarf livebearers that I can recall off the top of my head. I don't think the dwarf livebearers school, though. There are more nano fish out there too.
All the fish I would have suggested are here, neons, galaxy rasboras!
I have cory cats for the bottom, they're nice, you can also get pygmy/dwarf cories. Otos are a popular choice on here, I like them too, but have no room for them! Or some kind of shrimp, technically they don't add to the bioload so can get more than you think and a few grow to an inch, some a little bigger though. They need a lot of algae to munch or you will have to add algae wafers for food.