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Why did you let it go for so long, you should have had ask someone on here to borrow some, is this the second time this has happen to you sorry to hear.
Well John I had the same thing happen to me, I come down to taking the Bio pellets out and just do water changes every 10 days to 2 weeks, and went back to GFO and carbon my tank never look better, that is my 2 cents.
Well if you are going with a mag 5 then the outlet is half inch no need for one inch, go with half inch pvc all the way and add in your ball valve and a union so if you have any problems with pump you can disconnect real fast and fix or clean.