A friend's kid put a cheese it flavored cracker in my 10 gallon tank. I've got guppies and otocinclus'. I did about a 40% water change. Any other advise on what to do, or even if it's as bad as I'm making it out to be?
Is it just one cracker? If so, it's not a huge worry, and I think the water change is a good start. You'll need to gravel vac really well to make sure you get it all out.