I have a 67"x23.5"x23.5" , a tad width wise, but its the biggest that would fit through my staircase. i currently have an 7" rtg, i was wondering if it is advisable to comm 2 more aros. Maybe green and/or another rtg.
Seems to me that tank would be awfully cramped once the aros have grown. I can't imagine 3 two foot plus fish living comfortably in a tank that isn't even 6 foot long.
You need a bigger tank to comm aros, imo. The tank you're describing is big enough for one asian. Maybe look to add dats or bichirs, but again that would depend on filtration.
You can comm with two or three more RTG. Don't get the green or red, since they tend to grow bigger than 24". As long as you provide good filtration, your tank is not too small to house 3-4 RTG.