The Thai Mudskipper, Periophthalmus septemradiatus, reaches about 4" TL, making it an ideal specimen for smaller aquaria. 4-6 of them will fit nicely into a 30 long without a problem, providing there's a good amount of climbing places for them. This is a brackishwater species (1/4 seawater), and will not do well long-term in freshwater. They are not fussy feeders, and will accept frozen bloodworms, frozen mysis, flakefood, pinhead crickets, and the like.
$9.00 each, plus shipping
$9.00 each, plus shipping