http://www.wetwebmedia.com/ca/volume_2/cav2i5/seahorse_feeders/seahorse_feeders.htm
Theirs is not all that difficult to duplicate ... my versions are in boxes in storage or I would post pictures
http://tinyurl.com/n5vrjpq
If I ever get the Makerbot out of the box ( had the thing for months and can't seem to get to it ) I will make this one
http://www.advancedaquarist.com/blog/how-i-use-my-makerbot-3d-printer-for-feeding-seahorses