There are white, maybe light pink worms in my sunstrate. What are these little worms and can my fish eat them? *Background* I grabbed a bunch of wild aquatic plants that were probably white water crows foot to test out in an uninhabited tank and it all melted away killing the mayfly nymphs, caddisfly larvae and everything else that stowed away, but was welcomed to my aquarium...or so I thought. Before I got the tank it was outdoors in storage and I cleaned it thoroughly (cats are gross) and substrate is new, the filter media came from my established 75 gallon native tank and it does not have these worms. I can only assume these came on the plants from the cold water spring and survived the dead plant goo apocalypse last week.
There is a mayfly nymph and I've seen somehing else swim by too. I did a 95% water change to try to rid the tank of plant bits and they somehow survived. The worms didn't show up until today!