hey guys i have some white stuff on my air line hose it looks like cotton, i asked my friend what it is he said it looks like fungus it happens when the water stays still for a long time but i have my filter setup its wired the tank is crystal clear i have my piranhas in their happy or i think they are, not sure what it is the tank has been running for 4 weeks 3 weeks with the RBP's in their, any thoughts 
