Tank Help

[browneyes1182]

I have a 36 gallon freshwater tank that consist of mostly tetra's, Molly's and platy's. I have three different types of Cory catfish too. Yesterday night I noticed my albino Cory catfish acting stuck near my tank's Aqueon water heater. Then this morning I noticed, a green like crystal growth at the bottom rim of the heater and noticed a dark brown/green mess of the same type. I'm new to aquariums and I have no idea what this is or how to treat/fix it.

 

[gilpi]

Well, the green stuff is ok, looks to be algae. The white crusty looking stuff I'm not too sure, does your heater have any water inside of the glass, water beads, condensation etc?

 

[browneyes1182]

There's no water inside the actual heater, it's caked on and it was hard to get off. It's white. Maybe a mix of algae, leftover fish food and waste?? Where it's located in my tank it gets at least a good hour or two direct sunlight through the hexagon top mid day (noticed today since I wasn't working). Is that what causes algae?

 

[55tanker]

My guess would be calcium buildup.

Sent from my XT1049 using Aquarium Advice mobile app

 

[The_Desacrator]

I am thinking on the same line as 55tanker. One of my old filters had a similar buildup.