So I already own 2 D5's one is a variable speed the other is not. I'm still making my list of parts for my 900D build so I do have a lot of space. I'm pretty set on getting an Aqualis Reservoir. This is just a link for the top but it shows the entire assembly. I'm thinking 450 ML size with LED housing etc. http://www.frozencpu.com/products/i..._for_D5_Pumps_Compatible_w_Aqualis_41094.html Or maybe a monsoon bay resevoir (someone talk me out of this haha). http://www.frozencpu.com/products/1...rol_-_Matte_Black_w_Black_Trim_M2-D5P-MB.html The problem with either of these setups is only they only use 1 D5, but do I need 2? Another Option would be a dual top block for the D5's then hook them up to this: http://www.frozencpu.com/products/1...servoir_w_LED_holder_-_Nano_Coated_34040.html I do like the way the internal reservoir looks. (similar setup below) http://s1279.photobucket.com/user/S...65-9458-00000293A665379D_zpsb7836cbb.jpg.html Opinions? I'm thinking a single pump internal reservoir, is a clean easy install, so I'm leaning this direction, but if there's a huge benefit to 2 pumps linked by an aftermarket top and then run up to the reservoir (requiring 2 holes to be drilled as in picture above) then that is fine.