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Hi and welcome to the site and hobby. For me bigger is better and try to go without water changes. Have a huge refugium, and well sized skimmer that takes care of nitrate and phosphate levels. Love the separate sump and “system” of it all. There’s many ways to control nutrients to reduce or eliminate need for water changes needed to control nutrient levels these days. Although trace elements need to be managed if corals is your thing. With that said and my many decades and various tank size would say if a 20 gal is what you’re doing would simple fo water changes and forget sump, skimmer, algae scrubber or whatever to control nutrients, and set up an ro unit and do a water change a week instead of messing with skimmers, algae scrubber once a week. Have a nice quiet , clean, good smelling tank.
An all in one system is good in this regard. You also don’t need to add a skimmer to it. Also a fan of glass tank over acrylic, so not many, if any that I know of all on one that comes glass.
The issue with a standard 20 gal or whatever tank is that in fresh water proteins and crap sinks, in salt it floats so best to surface skim to filter, ie a hang on overflow or drill the tank for overflow that goes down to sump. A canister filter on saltwater tank is not ideal but many reefers have nice tanks with em
An all in one system is good in this regard. You also don’t need to add a skimmer to it. Also a fan of glass tank over acrylic, so not many, if any that I know of all on one that comes glass.
The issue with a standard 20 gal or whatever tank is that in fresh water proteins and crap sinks, in salt it floats so best to surface skim to filter, ie a hang on overflow or drill the tank for overflow that goes down to sump. A canister filter on saltwater tank is not ideal but many reefers have nice tanks with em