Ok, first we need to address the 'already fish' issues then we can get to new fish!
You have 5 barbs. I'm guessing they're tiger barbs, right? They can be aggressive when they aren't in a proper school (less than 6), which yours are. I would bump the barbs up to around 8-10, so they'll become less aggressive.
I had to go look up the leporidous, because I had never heard of the fish. It gets very big! I've read that as long as you keep it fed it won't be too bad. So, just feed them and you'll be good.
The clown loaches are an issue. They grow to 8-12" and get pretty large (I mean fat). They also need schools of around 5-6 to be really happy, which requires a tank of at least 125g at the min, IMO. I'm sorry, but to keep your fish as happy as can be you're probably going to have to get rid of them (only one large fish species in that tank).
Do you know what kind of danios? At least give a description. I do know that you're going to need to get another 4 of them because, once again, they are schooling fish. Oh and the catfish as well. Description please then we can help!
If you address the issues that I have stated above I think that you might be able to squeeze in a krib or two. But you'd probably have to get rid of the cats, which are probably going to have to go anyways because they're usually bottom tank fish and so are your giants, the leporidous.
Hope this can help!
