I have seen what I believe was Planaria once upon a time (not in my tanks). But, I do not think these are planaria...but I could be wrong.
I will go ahead and admit...I totally over feed this tank. Perhaps I do it because I want everyone to eat, like most over feeders do.... But I do it mostly because I have not yet figured out exactly how much to feed the snails..
I keep up on water changes..and I stay cycled..sometimes when it is getting time for a water change the nitrates creep up..but other than than I stay in normal ranges
And another bad thing I have done recently is to put feeder guppies in. I could not feed them to my puffs yet..until I knew they were ok and a little bigger...so they went in the snail tank..they are microscopic (Basically fry)! I suppose they could have brought in something...
FYI since the guppies are in there I have increased my water changes!..At least I did something good!
So, there I admit, I have been a little bad!
And My little "worms" probably come from me overfeeding, I am sure.
So, what are they? How do I get rid of them? Will they hurt my snails or snail eggs?