Thats a great idea, I was actually thinking of something kind of like that but using drip lines....the only thing is it will probably take FOREVER to drain this thing doing it this wayAmazing build... gave me more ideas on what to do. as for your drain plan if it's going to be "permanenet" or semi maybe set-up a soaker hose system and just flip the valve to auto water a certain area. or even hook it up as you need to instead of dragging a hose around to water everything.
I struggled with this also. I ended up running a 1.5" drain line behind all my tanks and outside to my yard. In the yard I cut up an old garden hose and T from that to all my bushes. It works great.Thats a great idea, I was actually thinking of something kind of like that but using drip lines....the only thing is it will probably take FOREVER to drain this thing doing it this way