I came back from my 2 week vacation to this:



Where do I even begin??

I'm changing out 50% of the water right now, but I know that will solve nothing..

Need some help, here! :)

I had somebody coming in to feed them every couple days..

But no idea of the cause of this.

I DID shut down one of my 2217 Eheim filters, as it was leaking, and I didn't want to worry about a wet carpet, but other than that, no idea..

Window was closed, lights and CO2 were on auto (8 hours each)..

Thoughts?

What do I do?