well..i have a 125 gallon. i have cardinals, rummy noses, blackfin tetras, rosy barbs, marble hatchets, congo tetras, otto cats, pencil fish, albino bushy noses, regular bushy noses, 6 young discus, sterbai cats, panda cat, albino cats, guppies, swordtails, oh and some penguin rasboras. im overstocked..but its working. been 8 weeks now..and eveyrone is happy. only fish i had that didnt work so far are the red eye tetras. kept dropping one or two a day. down to a few. the rest are doing well. but my heats not that high. 80 degrees.
i have a big rena filter and a 500 aquaclear.
try keep ti fairly simple . i dont know the torpedo barbs..but if they are like the tiger barbs..the could harrass them. no idea. stick to small and peaceful schooling fish. try sticking to amazon type fishes. pencil fish are neat..and they have a line down them. and red in their fins.