we kept several triggers together and they did fine. they were a niger,pink tail, and an undulate.before the niger we had a black belly,huma huma, and the undulate. the black belly and the huma huma have since passed on, the only trigger we have that we have to keep sperate is the blue throat because it is to passive and was getting beat around. as for the spiny box puffer are talking about a bridled burfish or a porcupine puffer? because we tried the bridle burfish and he died not even 24 hours later, he stressed out. the porcupine puffer was alot of fun. they have alot of personality. i'd also scrap the clown. we have also found that if right before you add your new trigger you change the landscape there is less fighting.good luck.