So, that is all the tanks in the pic? The 120 and the three sumps?
Are you wanting the sumps hidden? Doesn't really matter at all.
Is the 120 drilled in any way? Neither does this. I guess I am just being nosey. Sorry
If hidden or not, I would build one stand or two stands to hold the tanks. Since you have to drain the tanks to move them I would drill them for durso style drains. In this case I am not so sure boxes would need to be use to skim the surface. It just needs to be a bulkhead with plumbing on the outside. The OF boxes would help for sure to keep the concentrated protiens flowing into the skimmer. A difference in height should be all that is needed. Gravity is our friend. By using dursos they would just be drains moving water into the next tank, finaly ending in the third sump where the return pump will be. Then plumb the return into the 120. Your dursos will establish how much each sump can hold and they won't add really anything to the back siphon from a power outage. You can put in power heads in each sump to handle the turn over to keep every thing happy.
Doing it this way makes it simple. It also allows each tank (depending on where you drill them) to be used again as tanks. So you can sell them as tanks and not sumps, when or if you get one big tank for the sump.
What do you think?
