Eastland :

The thread below is about an on demand feeder. It interested me at the time but I have not had time to make one . You might be interested . If you make one let me know how it works. ewest

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=10;t=000128

ps : just looked back at the ref. and you were on the thread.