Hi, I am new to this site and also new to fish keeping, I have just had 2 zebra danio fish die and have just noticed very small black things on the glass they look like very small tadpoles, I have been told that they are FLUKES, can anyone confirm thast this might be the case and any idea how I can get rid of them. My tank is a rio180 and I have 3 live plants in there and did have 5 zebra danio but are down to 3. Any help would be fantastic. Cheers.