I'm dripping between .5-1gph on my tanks, at first I put sponge over the pvc hob overflows to keep fry and other small critters from getting in the pipes but I had a few floods from the sponges getting clogged. It's amazing how much debris they catch with such a low flow, albeit It wouldn't be enough for my tanks, since I keep them overstocked.
I think 3-5 drips per second amounts to about .5 gph judging by the drip emitters I use to use. From the picture you posted it looks like that tank has more of a flow than a drip, but you can't really tell from a pic.
I used emiters at first but the .5's kept clogging so I changed them all to little valves. It works better since I can change the rate depending on the stock.
It's nice to see others that don't mind "modifying" their house to fit their hobby

I run the drip and drain into 4 rooms on 2 floors - that's how much I hate wc's. My water goes down the drain; I haven't been able to come up with an alternative for recycling that will work at my house. I really wanted to water the yard and bushes but haven't worked out the logistics of it. I was draining into the sump but that pumps to the street in front of my house, I had to change that or I would have turned the entire street into an ice skating rink.