I have been keeping pipefish in my reef tank for years. My tank has 25K gph of internal flow plus a 30g second story surge tank which dumps the water at a rate of 22K gph every few minutes.
The pipes do great in the tank. My current pair of dragon faced have been in the tank for over 15 months. I am looking for some banded pipes to add.
Sometimes they will swim into the water column, and wait for the surge to cycle to ride the current across the tank.
In addition I have a red mandarin, green mandarin and target mandarin. I have an outside 250g sump/refugium and the pod population is great. We recently dipped two maricultured colonies that were in the outside tank for 2 weeks and had over 100 pods in the dipping container... Crazy pod population.
Dave B