Welcome to Maast!
15g per week is fine. Most do a 15-20% water change a week. Some like myself do not do a water change every week. It comes down to personal preference and if your tank inhabintants are happy and doing well. Also a good skimmer is a must with a FOWLR. A 55g FOWLR will become small very quick, I say this because the fish that people normally put in FOWLR are larger species. With that said they will quickly out grow a 55g and become aggressive towards one another. Just watch your stocking and you will be fine.






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