This is my 180 (72x24x24) that I plan to add a 5" Tigrinus to. It has a 29 gallon wet/dry with 10 gallons of bio-balls and twin Mag Drive 7's for returns. It also has 2 Eheim 2217 cans so filtration and flow/turnover is good. I am wondering about aquascaping, you can see I have driftwood and fake plants, any changes I need to make to it?? I also use 100% RO/DI water and I need to know what GH and KH these fish prefer. I am still wondering about tankmates, I am sure a Black Arowana would get too big for my 180 when grown so that leaves me wondering about a couple good and gentle tankmates. Dats have been suggested and I am trying to source a couple now but I'd be open to other ideas for sure??? I thought about Gold Severums but someone said they may be aggressive towards the cat? Tinfoil Barbs may work, but they aren't exactly my fave. I'm looking for the Siamese Tiger Dats, masybe that's the way to go? I just want to make sure I have everything ok before I drop $250 + shipping on the Tigrinus!!!! I am currently doing a fishless cycle with Bio-Spira and it is proceeding well but slow. Any advive from the people who have Tigs would really help alot.