I have 1 catfish, 2 silver sharks, 1 tiger barb and about 4 guppies and need to add more fish. I want some more tiger barb as mine gets lonely but what else should I add that will get on! New to all this as you may have guessed!
Hmm, I have to say, you probably should be wary of adding any more fish into that size of a tank (you are already overstocked). Furthermore, I would highly, highly recommend re-homing or returning those sharks... they cannot thrive in such a small tank... if you wanted to find a new, bigger home for the sharks, you could fill out your school of tiger barbs (though, they would probably fin-nip your guppies)...
I would not suggest buying any new fish until you've sorted out your current dilemma!