Quote:
Originally Posted by GreenSpottedPuffer
This worried me as I use the ATK haha...
Are you saying the optical sensors are garbage? Or just float switches in general? I don't actually use the float switches but I have been using the optical sensors for years. I am always worried in general about auto top offs. Never had one fail but I hear about it all the time.
Sorry to keep the derailing going 
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I had my new Neptune ATK fail after a couple months. The sensors would cause the ATK to not fill, then completely fill and the end result....300g SPS dominant with a lot of wipe out due to salinity fluctuations. So in short, I totally understand the fear of a mechanical or optical float.