ULTRAREEF TOP-OFF users?

[camel shrimp]

Let me hear some pros and cons. I am considering one of these units.
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blue moonshine photos

 

[SPC]

Used one for a year, never had a single problem .
Steve

 

[Iron]

Ditto. But I would clamp it on so it won't fall in. And IMo I wouldn't trust it to much= I don't use 30gal of top off only 15 incase it sticks