Krib compatibility
 

Will a male and female kribensis be okay with four zebra danios and three otocinclus in a fifteen gallon tank? What invertebrates could I put in there?

I think this would be a wonderful setup. Kribs are naturally shy and the use of dither fish, such as Zebras, is a great idea.

Invertebrates?

Re: Krib compatibility
 

you could try placing maybe some shrimp but dont expect them to live much if the kribs like em xD umm you could try snails(just one apple snail)

My kribs developed a taste for ghost shrimp, so I'm not sure if I would risk any type of shrimp. You could always give the ghost shrimp a shot, though, since they're really cheap.

Mystery snails would be a good choice. They don't get anywhere near as large as apple snails and won't eat your plants. Malaysian trumpet snails are also nice, but they will reproduce like crazy. They're practically essential if you've got a sandy substrate rather than gravel, though.