Hey Gman Just a quick thought about leaving shrimp in and going away for 2 weeks. You might want to try it out once or twice before you count on it. What works for 1 puff may not work for another. You wouldn't want him to polish off all the shrimp in a couple of days.
That's very true....Thx for the suggestion It's been 2 days since I put them in and up until last night there were still a couple left in there... I will check again tonight when I get home from work
its hard to say really, which doesn't help you much!!! Your puffer could associate anything moving on the gravel as food or it may not. Hveing never kept bumblebees I couldn't say for sure what would happen