Are worms a problem?
I have an aquarium (round about 100 litres) with 18 baby guppies and 2 algae eaters. I've had the algae eaters with two other guppies (parents of the babys) for about 3 months. When I bought some new plants, as I like have real ones. I discovered that with them I also got some very small snails which have now grown quite a bit in size and number but that didn't really bother me as I can see no harm in them for my fish. But three days ago my male guppy died (the female died giving birth) and today I saw a small worm swimming in the water and then hiding at the bottom in between the little stones.
Does anyone know if these worms are a problem for my fish? This is my first time with tropical fish, and I really want to do a good job of it. Thank you =)