I like the Aqua-C remora. For HOB this is one of the better ones and is easy to adjust.
Mine took a while to break in but works pretty good
MSRP on it is $165 but I'm sure you could get a used one cheaper
I use one on a 54 corner.....there is no room underneath for a sump so I run 2 canisters(only 1 fits in the cabinet) the aqua-c hang on skimmer,a chiller and a hob fuge too.
For a fowler system it works pretty good.
Was worth the money