Ok so the original stock list was
6- bala sharks
6- rainbow sharks
3- Colombian sharks
2- plecostomus
1- iridescent shark
And you said no to iridescent,Colombian,and bala that leaves only the rainbow sharks and plecostomus. If you are going to have a tank this size with just rainbow sharks and plecos then I recommend picking up a ton of Cory catfish (like 15) if you have a large school they are really cool and they are awesome to watch but I would hate to have just rainbow sharks and places if I had an open tank opportunity this size I would throw in some cichlids and alot of aggressive small fish. Actually what I'm experimenting with right now is buenos aires tetras which look and feed like red belly pirhanas and they are really awesome fish and in a 120 you could get like 20 and they will school and they just look so cool if I were you I would pick up like 20 of them and at petsmart right now they are only $1 usually like $4-$5 so u decide but that's just my choice and the buenos aires only get like 3 inches I think maybe smaller
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