Help With Tiger Barb Aggression ?

[Cdb1992]

Hi I have a 30 gallon freshwater tank, 24x18x12 I believe
Not getting into chemical levels or equipment I use because it is unimportant to my question
Lol I recently added a shoal of 6 tiger barbs on the small side about 1.25" at the largest at first they seeme alright and actually witnessed them picking on each other which is normal, but I have 2 medium size dalmation mollies(pongo & perdita) and a dwarf red fire gourami(ol red) and a group of for green Cory's , I noticed the barbs picking at the gourami this morning fed them to distract their attention(frozen blood worms they love em!) an it stopped for the rest of the day, sadly ol red had some moderate fin damage I observed this evening them picking on my male dalmation Molly pongo, he is fine as I caught it in time and fed to distract them, (has not bothered the female but I think she'll be ok she's a bit on the bigger side and has actually killed a male betta(crown tail) how can I stop the barb madness without rehoming? More tb? More food? Ideas? Help?

 

[Joshjr619]

Try to add more decor so there is more hiding places as this has helped me out.

 

[the_lock_man]

I don't think you really have the space, but if you increase the shoal to 12-15, it would probably help. That said, those lovely long thin fins of the gourami are just ssssooooooo tempting to a tiger barb, you may just have to take more drastic action.

 

[MBOU]

As has been pointed out really, too small a shoal in too small a tank

 

[This Old Spouse]

I've found that fewer than 10 tigers results in escalated aggression. When I had 13+ they were all fine, even with each other. 
 
If you start feeding them more to distract them, they will overeat and with tigers, this is a BAD THING. They'll eat until they explode, they're so greedy.
 
I'd seriously rehome them, or buy a bigger tank for them and at least double their numbers. With them, it's definitely the more the merrier. Otherwise you're doing them and your other fish a disservice.