A lot easier to understand with the pictures.......
It looks like it will work fine, of course you never know till you actually build it. Nothing stands out as a blatant error. I'm looking forward to seeing this up and running.
Another option, depending on your drain, would be put that last pump going from the 55 to the fish tank on a timer. Run it for 10 minutes every hour or some other frequency that would be determined at a later date. That way the pump wouldn't be forcing water through a drip regulator 24/7 causing it to fail sooner than designed.
or
Put a return loop on that last pump (like a Y) so most of the water goes back into the 55 and only 1 or 2 GPH actually makes it to the tank. It would be a simple ball valve, easy to control if you wanted to add more GPH to your tank. This would put less head pressure on that pump and add to the mixing in the 55 for the same or possibly less electricity.
It looks like it will work fine, of course you never know till you actually build it. Nothing stands out as a blatant error. I'm looking forward to seeing this up and running.
Another option, depending on your drain, would be put that last pump going from the 55 to the fish tank on a timer. Run it for 10 minutes every hour or some other frequency that would be determined at a later date. That way the pump wouldn't be forcing water through a drip regulator 24/7 causing it to fail sooner than designed.
or
Put a return loop on that last pump (like a Y) so most of the water goes back into the 55 and only 1 or 2 GPH actually makes it to the tank. It would be a simple ball valve, easy to control if you wanted to add more GPH to your tank. This would put less head pressure on that pump and add to the mixing in the 55 for the same or possibly less electricity.