tthose are brackish and very aggressiveIt's a figure 8 puffer fish
im pretty sure mollys need 30 gals,but either way you got repHello,
A 10 gallon is way too small to be holding both a Figure 8 Puffer and a Molly.
The puffer, getting around 5 inches, needs at least a 30 gallon tank by itself.
The molly, being one of the biggest livebearers, get around 4-5 inches and need at least a 20 gallon tank
I would recommend you either get a bigger tank for the puffer and a seperate tank for the molly, or returning them for other fish