I've got my 5" Veiltail Oscar in a 130 g with 6 Clown Loaches, 3 of them are 6" and 3 of them are 3"-4", she's fine with them. I tried Silver Dollars with this Oscar and it was a chasing frenzy but she's never even acknowleged the Loaches. The Oscar does have to go hide in the corner with her earthworm or the Loaches take it away from her lol
One thing about Loaches-they really need to be in groups, the bigger the better but at least a trio of them. I don't like to keep them in groups less than 6 myself.
