Pico reef !!
Don't know if this is any help but heres one of my picos
that has a coralife aqualight Mini w/9w 50/50 + 9w 10k pc, You can make a nice little hood for the 2.5g with small pc units. As far as maint. there is a guy on nano reef.com that created a tool called the nimble works like a mag float but not an eye sore. I have a bunch of pico,nano & deco tanks they are alot of fun You can make them in almost anything like wine jugs,
iced tea pitchers, The real hot ones are the rimless cubes !!
Al
Heres a couple of pics with coralife mini & A custom stand/Hood for my 2.5 the hood has 13w 50/50 + 13w 10k, 4 comp. cooling fans + 5 light LED bar (added since pic), high grade reflector. Hope this gives You some more to work with any questions please ask !!