System Upsize

:hismiley:

i currently have a 175gal display tank which im planning to make a sps dominated tank. My current sump is 50 gallons and my refugium(16gal) is part of it. I just got the reef octopus regal 300 sss as my new skimmer and its great! My return pump is about 1320 gph. I use vertex pro bio pellets in my vertex rx-u 2 and gfo in the rx-u 1.5. MY ro/di is a vertex puratek 200gpd. Lights are a 8 t5 fixture and another led fixture (150 white leds) and 2 long blue t5s.



Current livestock:

- 2 large yellow tangs

- 1 large purple tang

- 1 ocellaris clownfish.



i feed them very few quantities of food (once a day), and nothing sinks to the bottom of the tank.



My phosphates are low but im having a problem in maintaining my nitrate levels, and i got a very large amount of cash now and im thinking of upgrading a few things in my tank and my overall system.



Upgrade ideas;

:lightbulb: im thinking of adding a 110gal refugium beside my display, and another 110gal tank under the refuge which i dont know what it will be.... (plz post your ideas, and im thinking of splitting it in half and making one half my salt mixing unit)



:lightbulb: im getting an auto top off system(i have a 16gal extra tank for storage).



:lightbulb: i took a look at the ecotech radion xr30w g3 pro lights and im thinking of getting 3 for my display tank, and shifting my current light to my new fuge.\



:lightbulb: upgrading my current chiller to a JBJ ARCTICA CHILLER 1/3 HP.



:lightbulb: upgrading to a new 2400gph return pump which will be connected from my sump directly to the refugium which will overflow into my main tank.



:lightbulb: should i get a carbon reactor?:rimshot:



im currently waiting for my red sea Ca, Mg and Alk test kit, which will be followed up by the required calcium reactor, then hopefully the sps'.



Please reply in the shortest time possible as i have to make a fast decision and please give me your opinion on what my extra 50gal tank should be



Thanks in advance:D