By the way, I appreciate your input. Thank you.Thanks!
The tank is a Reefer900, I have a Reef Octopus 250INT skimmer which takes up most of the sump space. The extra sump is being used for ATO. do not currently have about 10 fish currently and may add another 3 in the near future. Nitrates about 25, Phosphate about 0.5. Currently running Chemipure Elite and water changes that do not seem to make a huge difference in the levels above. I feed 4 times per week approx 1 cube/3.5g each time.
The foot print of the larger reactor Will definitely be challenging. External installation is unfortunately not an option because of location of the tank. Equipment cabinet is jam packed with equipment already as well.