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Since no one has replied, I'll offer my 2Â¢ although I have never used this type of HOB
Not sure how large your tank is or what kind it will be (FO
or reef) but I wouldn't suggest something like that. The bioballs can be an added benefit for biological surface areas in the absence of LR
but they can also be a detriment. There is limited space in the chamber so a very good chance of detritus accumulation which would make it hard to keep clean. If you already have this unit, it may be possible to mod it into a HOB
The skimmer portion also look quite week and being a venturi style skimmer is not very efficient. They usually require a fair amount of modding before you get any real performance. Even then, they are usually not very good.
I would suggest posting what kind of tank you want and equipment you already have and ask for alternate suggestions. For the same money, you could easily get a good stand alone skimmer instead.