So I've done some quick research and have come up with "Planaria". Although they don't quite look like them. Anyhow, I have just discovered tiny white worms about a half a centimeter in length and maybe one or two millimeters in width. They seemed to come out of the gravel while i was vacuuming it. I found them swimming around in the bucket. I can't see them swimming around the tank at all. I did overfeed recently while I would have been suffering from clouded judgement. So I'm assuming they are due to the excess uneatten food. I have never been one to overfeed, but that's because I normally feed before it's party time (for me). Are they indeed planaria? If not, what are they? Are they harmless, harmful, etc. Also, should I be worried about ridding the tank of them (if they happen to be harmless that is)? One thing I have noticed recently is that the rasboras seem to be having white or clear-ish poop, but I feed them dark coloured food. Are they eating the worms? Sorry for the scarmbled post, I've got a lot on my mind. Many,many thanks and appreciation to any help and info!