![I found this orange crusty stuff growing outside my heater, what is it? It looks like a sponge to me but I doubt that's what it is. : r/Aquariums I found this orange crusty stuff growing outside my heater, what is it? It looks like a sponge to me but I doubt that's what it is. : r/Aquariums](https://i.redd.it/la6wrdttwus71.jpg)
I found this orange crusty stuff growing outside my heater, what is it? It looks like a sponge to me but I doubt that's what it is. : r/Aquariums
![What is this brown stuff hardened on my aquarium heater? I just checked on the tank and noticed whatever that brown stuff is on the heater I couldn't get it off will What is this brown stuff hardened on my aquarium heater? I just checked on the tank and noticed whatever that brown stuff is on the heater I couldn't get it off will](https://i.redd.it/53q4djwqrgt91.jpg)
What is this brown stuff hardened on my aquarium heater? I just checked on the tank and noticed whatever that brown stuff is on the heater I couldn't get it off will
![Just noticed this fuzzy white mold growing on my heater, can someone tell me what to do about it? : r/Aquariums Just noticed this fuzzy white mold growing on my heater, can someone tell me what to do about it? : r/Aquariums](https://i.redd.it/ncixvxjqkop11.jpg)