Just bought the UNS 60A all in one

As title says i just bought the UNS 60A all in one. Its 16.5 gallons for the main tank and 3.5 gallons for the filter area. With that in mind what sorts of stocking do you guys think i should go with? I'd perfer some sort of community fish as species only tank (although cool in some areas) arent all that interesting to me (minus maybe kribensis but from what i've seen they like 30 gallons). Any and all suggestions for a freshwater fish are welcome. One more thing to add is dont worry about difficulty in keeping them. The tank isnt here and i always do a 1 month fishless cycle so i have at the min 1 month to do research and get the supplies i'd ideally want for a fish.

one extra thing to add is would it be smart to do kuhlis loaches in a tank this size or should i stay away from them till i get another bigger tank

TLDR: What freshwater fish would do well in a tank the size of a UNS 60a all in one. Also would Kuhli loaches be okay in a tank this size