Id like to build a sump and have a frag "tank" as a fourth section in the sump. does anyone have a good design for this? i can plumb now but i have never built a sump. I was thinking a 20L in this order: return, fuge/skimmer(how i have it now, i use a small tunze skimmer and its fine), frag section and then return. Id also need a suggestion on a good light for frag section and fuge. I was thinking another one of the led units i have but id like a smaller unit. Anu help here is appreciated