So I am putting together an led light for my algae tank (a 50 gallon). I have 4 6500K led boards (25 watts each) that will fit beautifully on a 2" by 48" heatsink from heatsinkusa.com. I want to get the heatsink drilled and tapped so I can easily mount the led boards. I am going to ask heatsinkusa for a quote, but before I do, I'd like some input. First off, where could I get a 4 foot aluminum heatsink drilled and tapped locally, just incase I decide to get it done locally. Second, how mould you go about mounting such a light to the tank? Third, what should I use for a splash guard and how should I mount it to the heatsink? I thought about using a clear acrylic tube cut in half the long way and screwing it into the heatsink, but it turns out that the tube cut to size would cost more than double what the heatsink costs! Any other (cheaper) ideas? Thanks!