I've been keeping a 25g for over 2 years now and it is very little maintenance. I have a HOB skimmer and an Aquaclear 70 that I run my sponge filter, carbon and Chemipur Elite in. Everything grows well and no pest algae in the tank. I have a 2.5 gallon pail that I do weekly water changes with and within 15 minutes all the work is done with the exception of feeding the fish. I've been slowly transferring my livestock into a new 90 gallon and will be converting the 25 to a frag tank after I sell off my soft corals but I've really enjoyed the small tank and never had any issues with it. If you can commit to doing a small water change every week without exception then I don't think you will have any problems with a small tank. Take some of your live rock and sand out of your 175 and you won't even have much of a cycle if any at all. Good Luck!
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