I currently own a Floerwhorn, (male) in a 100 gallon tank, he is a solid 5 inches, i just came up on a 150 G, now i would like to add some tank mates...... my question is this, what fish would go well with him if any???? and if there is a chance of them getting along will it stress him out??? i don't want a stressed fish....... what about a smaller less threatening fish like a green terror? anything???