Need larger nano tank with sump. Need suggestions

[Ilovefish111]

I currently have an innovative Marine 15 gallon AIO tank. I have a mixed reef. I am looking at getting something that has a sump where most of the water is in the sump and I have about 20 gallons in the display tank. Looking for a total of 30 gallons total between some and display. Ideally I would like something that is prefabricated where I do not have to drill out similar to the old school Red Sea nano 28 gallon. Which I know now is discontinued. Ideally I would like to find the Red Sea reefer 28 gallon nano but it has been far few and in between. Let me know if you have any alternative ideas.

 

[Dread Pirate Dave]

Possibly one of Fiji Cube's external overflow tanks 10 gallon Aqueon DIY sump?
https://www.fijicube.com/collection...external-overflow-rimless-nano-tank-fiji-cube