Try to get the biggest tank for them within reason. I keep mine in a 40B. They move around A LOT and use every bit of tank space. I caught my pipefish and horses wild in the bay, so I don't know if you could get away a smaller tank for tank raised or not. I know people say to have very low flow with these guys, but I use (2) 500gph powerheads plus 200+gph return pump and they do great. They love live rock as well. Just be ready for tube feeding several times a day as they are not fast enough to catch much, especially pipefish, which starve more often than not.