Difference between Hydra's and Hydra 52's?

[Breakthecycle2]

I currently have two Hydra's over my Elos system 120 and now I saw on reef builders that you can get the 52 upgrade kit. Is there a difference...a real difference?

 

[ReefMadScientist]

One, the Hydra, would be perfect. The other, Hydra 52, is overkill.

So you can get both and run the Hydra around 40-65% or you can spend more money and get the 52 and have the percentages around 15-30%.

Hydra 52 is for deeper tanks. Yes, both can be used on any tank but it makes zero sense when the Hydra can do the exact same at slightly higher %'s.