It is always a gamble but IME the larger the tank, the better the chances of success. My flowerhorn, umbee, viejas, midas seem ok in 4500 gal between themselves and a ton of tankmates including six irwini. I'd not dare to try this in 240 gal.lol lucky for me. You think they could co-exist w/ Dovii or at least RTMs and Jags?