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Hi all. I picked up a coral beauty angelfish for my 30-gallon tank. My 30 has most of my collection of corals and I got unlucky and got a coral beauty that picks on all of them. I also have a 20-gallon tank set up that isn't fully stocked yet so I have moved the fish to that tank. I think 20 gallons is a little small for a fish that size and I had an Idea that I thought might help but I want to get advice first. I've posted to this forum before about getting a tang and everyone informed me of their need to do lots of swimming and that my tanks just couldn't provide the needed swimming space. That got me thinking. If bigger fish or fish with a more active lifestyle need to get more exercise to be healthy and happy then could I supplement more tank space with more water flow. Obviously, it would never be a substitute for actual swimming room but if I increase the flow a lot would the tank maybe feel larger to the fish since it needs to swim harder to get from one side to the other? Could increasing the flow help my coral beauty be healthier and happier in my 20 gallon? Right now my 20 has a small powerhead that is rated for 200 gph and a hang-off protein skimmer and two hang-off filters that add some flow as well. I have a bubble tip anemone in my 20 and it's in a perfect location where it can't bother my zoas and frogspawn which are the only corals in the 20. I don't want a change in flow to inspire my nem to pack up and move so I don't want to add more flow if I don't have to. But I'm totally prepared to take that risk if you all recommend that more flow will help a larger fish feel more at home in a borderline tolerable tank. Let me know what you all think!