cometcattle
Go Hawks!
What are the differences between the two?
I've seen them called both.
I've seen them called both.
I also have a little Sparkling Gourami, so I can definitely tell you they are two different species. Sparkling are Trichopsis pumilus, and Croaking are Trichopsis vittatus. Often Sparking Gouramis are called Dwarf Croaking, and things like that, so there is quite a bit of confusion. In fact, Sparking stay quite a bit smaller - mine is maybe an inch long, and my croakers are about two. They are some other slight differences too, such as the shape of the head and tail. Overall, I can see why they would be confused as they look quite similiar, but it drives me crazy when people say they are they same because they ARE different. 
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Oops.juliethegr8t said:Overall, I can see why they would be confused as they look quite similiar, but it drives me crazy when people say they are they same because they ARE different.![]()
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It sounds like you might have a croaker. How big are they all? If one is significantly bigger, you might be right. Is his tail pointed? My sparkler has a round tail, and the two croakers are pointed - they are the ones in my sig. 
They're little Sinatra fish.

Sinatra fish!! That's so awesome, and fits them well. Yes, mine croak constantly. They wake me up sometimes they're so loud!! I believe I have two males though, so that is why. They circle each other and flare their fins, while undulating (good word!) their bodies.
Very neat stuff. If you ever find another croaker, grab it and you'll hopefully be able to hear/see it. Neato stuff. 