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Check your water source, see if your township adds chloromines to the water. Mine did that a few years ago and killed all of my SPS. I wouldn't treat for something if you don't actually see bugs.
Are you actually seeing white bugs? Interceptor can kill a wide range of inverts so maybe get anything out of the tank before you start it, IF you go down that route.
Any particular reason you want to go with AIO vs tank and sump? More water means more stability. 60" is quite a bit of space and you could definitely get a nice tank and sump.
Very common issue. Actually have already replaced one and have another with the exact same issue. It still manages to keep the Apex Powered and the DOS pumps running just nothing with the outlets.
Chemi-pure (Depending on version) already has GFO (Ferric Oxide) in it. I believe its Chemi-pure Elite. Chemi-pure blue has Purigen included so Elite is more beneficial to Phosphate removal.
GFO will also lower your alkalinity faster so need to keep an eye on that.
Phosguard does the same...
I know you are fairly local to me, if you have any rocks covered I would gladly take it off your hand and replace it with another rock to help feed the soon to be growing colony