Here is a link with info and pics on them;
http/www.planetcatfish.com/catelog/mocho...odont/334_f.php
so you should get some more but only if you tank can fit them in- how many gallons is your tank?
I'd like to discuss some issues in your stocking though seriously;
1 Female Betta( 5 Coming )
2 Clown Loaches
4 Black Skirt Tetras
1 Bloodfin Tetra
3 Goldfishes
1 Upside Down Catfish
1 Tiger Barb ( Two Died )
The clown loachs- clown loach live for up to 40yrs and need a 60gallon tank although they only grow an inch a year they get to a foot long.
Black skrit and bloodifn tetra- tetras should be kept in groups of at least 6 of their own kind, so you need to boost both of your tetra species numbers if your tank can handle it.
Goldfish- under NO circumstances should you keep coldwater fish like goldifsh with tropical fish, its a slow and painful death for them and a miserable existance- people have coldwater and tropical fish tanks for good reasons otherwise we might as well put them all together.
Your upside down catfish needs more of its own kind as mentioned, what are you feeding it and your other fish currently?
Tiger barbs are notrious for being agressive and bullying towards other fish and should never be kept on their own and not mixed with the sorts of fish you have.
You have some major fish stocking issues im afraid and your fish are not happy, please refrain from making impulse purchases on fish you havn't researched thoroughly before hand in the future- how many gallons is your tank?