wow...
ID sharks get far to large for your tank and most tanks in general. the "smallest" species commonly offered gets to 3 feet long. the largest gets to 9 feet long.
get rid of the chinses algea eater, because as you can see they are very aggressive and it will eat your fish.
your tank is to small for a kissing gourami, which gets to a foot long. they are also pretty aggressive with other gouramis. until we know what kind of gourami the other one is, there really isnt much to say about it.
can you also provide pics of the pleco so we can identify them also?
the angel and corydoras are fine and should probably be the only fish to stay in this tank (possibly the black widows)
moving on
as for the fish you want to add; you should not add anything until you get rid of all of your monster and aggressive fish.
you should add on to your black widow school and stick with them.
danios also do better in groups of at least six, but their hyperactivity may stress out the angle, so you may want to stay away from them.
gold gouramis are extremely aggressive and will kill anything else in the tank that is smaller than they are. stay away from them.
ghost catfish are peacful fish, but they are to peacful. they will definitely be outcompeted for food in your tank, plus they NEED large groups to survive.
you should also add more to your corydoras schools before you add any more different species of catfish.
red tailed black sharks get very aggressive toward others of their species and toher bottom dwellers. not the best choice for your tank.
bleeding heart tetras are great fish but they are shy and therefore need to be kept in groups of at least 12. if you ditch the black skirts you could ahve a big school of bleeding hearts, and it would look pretty cool.
barbs can be nippy, so it is not adviseable to keep them with angelfish.
your angel sounds like it is settled in the tank well, and adding any other angels to the tank that are under 4' could be disasterous for them. if you want to add more, add two more and make sure you add them all at the same time and that they are the smae size, which needs to be at least 4 inches.
there is not enough room in your tank for discus IMO, whcih need to be ket in groups of at least six, and more being strongly encouraged.
are the glass hatchet fish acctual hatchet fish or glass fish that swim around the middle of the tank. regardless, its best to stick with one or two types of schooling fish rather than many of them with only haveing a few mambers per school.
i came up with three possible stocking lists for you-
stocking A)
1 angel
18 black skirts
6 of the leopard corydoras
6 albino corydoras
B)
1 angel
18 bleeding heart tetras
6 leopard corydoras
6 albino corydoras
C)
3 angels
8 balck skirts
6 leopard corydoras
6 albino corydoras
