@SuncrestReef Well I will be straight forward on this one. I was researching one night and for the life of me I cant remember where but someone had a very bad experience with the neptune ATK that made me pretty nervous to give it a shot. I have 3 DOS pumps myself and I am curious that I talked myself out of the ATK too soon. In my experience the Neptune products are rock solid but I was also curious with having a stand alone Aquasmart ATO and AWC. my first thoughts are the pumps are very small but according to their site that they can handle 6.5 ft worth of head pressure. I am setting up the AWC in the basement based off of that measurement so I will let you know... but the ATO is awesome with the optics rather than a float valve... So far I am happy with the decision I made but time with tellNice equipment! I'm also just starting my Reefer XL 425 build and have several of the same components from your list. I'll be curious to hear how you like the AquaSmart ATO & AWC. I was originally planning to purchase that, but at the last minute I went with the Neptune ATK and DOS for AWC since I had so many of the other Neptune modules and just wanted everything in the same control portal.
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