Well i did a bit more Browsing and FluidXP has been known to clog pump and rad fins -.- So thats out. Primochill looks good. I'm gonna go with this Zerex and distilled with some UV dye.
zerex
Zerex Super Coolant [ZEREX] : Performance-PCs.com, ... sleeve it and they will come
Has great reviews. Dunno about anti algae but its anti-corrosive. No one using it seems to be adding any biocide so I'm assuming it does both.
Gonna get some mean red dye with some blue smartcoils XD Gonna be cool.
Now I just have to figure out how to cut a window in the solid steel side panel. Wonder if jigsaw would work. lol bit harder than aluminum.