Hi there, so I may be getting two 2-2.5" IT on this upcoming Tuesday or Wednesday. These will be my first dats ever and my first real big time fish in terms of size potential. They'll be going into a 55 gal for the short term then probably into my 75 gal once 4-5" then probably a 120 stout down the road. My question is what is a good tank after that for at least two dats and should i go bigger if say I wanted to add something else such as a arowana. Would a 240 work? Does anyone just keep them species only, every video on them shows them with other large fish? I currently have five 1" spotted silver dollars in the 55 gal but I will most likely move them out so they don't out compete the dats for food. Would they make good dithers down the road? Also has anyone used a K1 filter with dats? I ask cause I don't know if they'll be freaked out with the constant motion of turning k1 media. Sorry for all the questions.