There is such a huge difference in price between an AIO and a tank, sump, and separates.
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I have had both AIO and HOB. My preference is HOB. It adds room to the inside of the tank.Personally - just me - I would never go for an AIO tank. So much better and more fun to buy a rectangle tank and add the equipment you want, either with a sump or with hob equipment.
I NEED a dwarf angel and a bristletooth tang, if possible.What is it you are looking to keep? If your looking for tangs or certain larger fish there a very few that would work even short term.if your looking to keep a few smaller fish, there are some good options that will still allow for good stocking choices. If you go 20 and under you can still do AIO or still have sump. When you get into the smaller/pico, stocking is limited. You can even go sump/chamberless but I don't recommend for anything above 5 gallons.
So first question is what fish and/or corals are you wanting to keep and what is your end goal?
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