I’m new to saltwater tanks. A few months back, my girlfriend and I wanted a fish tank so we bought a 37 gallon tank from pet smart. After I bought it, I immediately wanted to make it a saltwater tank. I upgraded to a fluval 307, and all the other goodies. A few weeks ago I went to the fish store and impulse bought a blue hippo tang that my girlfriend loved so much. The guy at the fish store said it should be fine since it was a baby for a while, but should definitely upgrade our tank within the year. That’s what i’m here for. I want to upgrade to a 100-150 gallon tank within the year. I would love to get an AIO, but they’re extremely expensive. Could anyone help me out in selecting all the equipment (excluding stand and aquarium) I would need for a 100-150 gallon tank? I would prefer the cheaper side if at all possible, but I would love it to look similar to an AIO (nothing showing outside of the stand).