20L ato recommendation

[CK00020]

I have a coral qt / frag tank and currently have a gravity type ato system with a 2l bottle on it. I am sick of filling the bottle.
Is the reefbreeders prism legit or will water level be way low? Any others I should be looking at

 

[vetteguy53081]

I have a coral qt / frag tank and currently have a gravity type ato system with a 2l bottle on it. I am sick of filling the bottle.
Is the reefbreeders prism legit or will water level be way low? Any others I should be looking at

Smart ato or duetto

 

[MrGisonni]

I use a single dosing pump as my ato. Takes a bit to get it tuned in but my levels are more stable in my 7 gallon sump.