I just lifted the otto feeding stones out the tank, I always find some snails stuck to the under side which I dispose of BUT I noticed something else tonight. At first I thought it was water running off a but on closer inspection it turned out to be either some sort of worm or maybe leeches. The front moves first then the back end follows, they were really small about 2-4 mms and there were about 4 on there. They're muddy brown coloured, if they hadn't moved I wouldnt have spotted them.
I've no idea how they arrived unless they piggy backed in on the weed I purchased. Sheesh some people get baby fish I get snails and worms.
What do I do? Will they hurt my fish and if they will, how on earth do I get rid of them?