white/yellow fuzz??

[citygurl7x]

i have a 5 gallon fish tank w/ only 1 fish now, a catfish. I'e been takin good care of it, but then today i noticed this fuzz practicly every where, near filter tube, on plants, on bottom, floatin on top. I don't know what this is n i'm startin 2 get worried. Is it left over food? Is it fungus? I have some pics attached. srry if they r not so good but its wat i could get w/ y camera. thk u

 

[meegosh]

Its hard to tell from the pictures. I would bet it is uneaten food. If all you have is a catfish in it, you would be ok feeding him half an algae wafer every other day. I would try that and see if you are still getting that fungus.