OK. Here it is. This is the inside of the dorm fridge that functions as the food holder.
On the outside I have a controller box which contains the timers and relays. It uses 2 of these timer boards:
The food is kept suspended by the magnetic stirrer. It is then pumped into the tank using a DIY peristaltic pump (not a recommended project). The pump uses 1/2" tubing to allow big food particles (mysis, brine shrimp and small krill) to be fed.
About once every couple of hours the pump goes on for about 15 sec and feeds the tank. That is then followed by a short blast of RO water into the tubing beyond the pump to flush out the food.
The container shown contains 1 gal and the timer is set such that it lasts about 3 days. Every 3 days I mix up a new batch and rinse out the container. I mix up about 30 small cubes of frozen food (mix of mysis, krill/plankton, brine shrimp, cyclops, and daphnia- in descending order of quantity) plus a chunk of Nutramar prawn ova and a chunk of Cyclopeeze to last the 3 days. That's for a 400 gal tank with the following fish in addition to corals:
yellow tang
sailfin tang
kole tang
regal/hippo tang
3 swallowtail angels
red hawk fish
ocellaris clown
5 anthias
Although I keep making modifications to the details of the feeder, the basic concept has now been in use on the tank for over 1 year.
Allen