Resident Aquarium Nerd
Join Date: Apr 2004
Location: Murfreesboro, TN
Keep in mind that you don't really need scavengers and they'll usually end up making things more messy (remember that they'll produce waste too!). They'll also need to be fed just like your other fish.
That being said, there are a few bottom dwellers that might work. Just the betta and platies will make your tank well-stocked already, though, so watch water quality. 10-gallons aren't too stable and can be tricky to stock if you want a community tank.
The only cory cats that will work are pygmy cory cats. The others are too large and/or active--they'll probably survive in a 10-gallon but won't thrive. Pygmy cories aren't always easy to find and have a tendency to disappear from the pet trade from time to time. You may need to have them ordered for you.
Shrimp are hit or miss with bettas. Some eat them, some leave them alone. If you decide to try shrimp, start with a freshwater ghost shrimp or two. They're very cheap so it won't be as much of a loss if they're eaten. If your betta is good with them, cherry shrimp would be ideal for a 10-gallon. They do best with lots of live plants and hiding spots. They're brightly colored, active, hardy, and breed readily. Amano shrimp are also a possibility. They're larger (perhaps not as likely to get eaten?) but a bit more sensitive than cherry shrimp. No shrimp should be added until you're certain that your tank is stable. I don't think the cherry shrimp would appreciate the salt but the amano shrimp won't mind.
Kuhli loaches are very hardy and a lot of fun. You're right, they don't like salt.
Speaking of salt, there's no reason to be adding it on a regular basis. That defeats the whole purpose. Is there a reason you're using so much? None of the fish you've mentioned need salt in any form. It can be used to combat parasites and bacteria--but that's because the sudden change in salinity harms them. If there's constantly salt in the tank, they'll just get used to it and it'll have no effect. The salt is also hard on your freshwater fish because they'll need to use more energy in osmoregulation (basically, they'll spend a lot of extra energy to flush the salt out).
If you'd prefer an algae-eating fish in the future, check out the bristlenose pleco as opposed to oto cats.
"We weep for a bird's cry, but not for a fish's blood. Blessed are those with a voice."
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