I am very happy with my Remora I got a couple weeks ago, but it spits out microbubbles.
The only thing I can come up with research wise is that Remoras spit out microbubbles when there is something weird in the water, etc. but my params are great and it just sits there happily generating bubbles anyway.
I have read that the surface skimmer boxes are useful for preventing microbubbles with Remoras; and also that it's necessary sometimes to cut the surface water intake slots lower if you're someone like me that waits until the water is 1" low before topping off with a drip feed. Otherwise it will suck air when the water level drops a little.
55, 1.025, 82F, trates/trites 0, amm 0, 65lbs LR