ok here are the answers...this was a tough one given the particular difficulty in ID'ing two closely related species AND also a hybrid:
starting from the top left and going clockwise -
1 - longnose gar
2 - crocodile gar "type II" (A. spatula x L. oculatus) - this guy changed pattern quite a bit a few times while growing.
3 - YOY Florida gar
4 - Florida gar (~1-2 years old)
5 - shortnose gar
BONUS: the tail in the lower left belongs to a Synodontis eupterus catfish...it was from this setup that i found that synos will also suck gar slime if they are hungry enough (the catfish was fine with the gars for a long time and worked well as a clean-up feeder, but i was out in the field for a while and he must have gotten a little hungrier). Syno was removed and i now advise others against it the same as plecos and flagtails.
ID process (main things to look for) :
1 - very long snout, elongate and slender body (relative to other gars)
2 - croc II - this is a tough one, unless you've seen pics of the fish before or know anything about crocs, you probably didn't guess croc II. stocky body suggests Atractosteus genus, but snout is more elongate than any of those species. pattern is dorsally a mix of spotted and some blotchiness of a YOY gator, lateral the pattern is almost completely random for a gar. the next color phase after this was the almost black & white "dalmatian" pattern.
3 - YOY Florida gar...at this time (photo was from 2005) we didn't have solid comparisons of true spotted gars...fish that looked like this were all from LFS and we now know they are FL gars.
4 - older FL gar...standard pattern you see on most LFS FL gars
5 - body slender, but not as much as longnose...snout long and slender, but not as long as longnose. pattern (or lack thereof) also indicates shortnose gar.
thanks to everyone who participated...lots of good guesses, and everyone at least got a couple ID's correct!
i believe xander has a new one to post, so go ahead and post to this thread to keep things rolling.--
--solomon