Quote Originally Posted by bckrazy
Congrats! Is the filter for the Betta? They don't need/enjoy any high-flow filters, if you want one a sponge or corner filter is the way to go. Make sure your tank is 1+ gallons, also. I recommend Stresscoat as an efficient and easy-to-use dechlorinator, and Hikari Betta Biogold is a great pellet food. You might want to grab some frozen Bloodworms to spoil him, too!

A healthy male Betta is:
-ACTIVE. Not completely sedentary, laying on the bottom, etc.
-FULL FINS. Please do not attempt to "rescue" a Betta with severe finrot. Not a good idea for a beginner.
-BRIGHT COLORING. No fungus or dull coloring.
-BUBBLE-NESTING & FLARING. Preferably, choose a male that has a little nest going (it'll look like there are bubbles on the surface), and will flare if you point your finger at him.
-*CLEAN, HEALTHY WATER*. Do not buy from a store who keeps their Bettas in filthy, or very cramped cups. Just don't! You don't want to support that kind of neglect.

Besides that, I love marble Bettas, so I would keep an eye out for marbles if I were you.
Thanks! I'll definetley take pictures