Semi Aggressive Tank: Could these fish go together without too much worry?

Tiger barbs are schooling fish and need to be kept in at least a group of four, same with thd silver dollars. Also, silver dollars grow to be quite large. if not kept in schools they will be quite nervous and unhappy. my suggestion would be to not get the silver dollar and just get a couple more tiger barbs, and youll have a nice setup. and i know you said you arent keeping bala shark for long, but do be careful for they do get quite large