Dragonfish

[Crypto]

I agree with others, I would recommend getting rid of the Dragonfish (Whatever it is. All the things listed as a dragonfish that everyone keeps stating, they all need bigger tanks than 30gs) and converting your tank back to freshwater. Yes, the mollies do thrive in Brackish, but for the best health of all your fish (Excluding the Goby) if you want to keep them alive.