Used to own one, price goes between 20-50$. Ive bought them for 20$ at one particular Maine store but have never seen another for less than 50. Ive never seen babies. They are very similar to marbled gobies, just the south american equivalent I believe. IME, they tend to be fatter and more aggressive than marbled gobies. If you dont think it can eat it, it is going to try. IME the most common way for them to die is choking on prey too large to actually eat.