White Worms in my Gambusia Holbrooki

I have a few, what seem like pregnant Gambusia HolbrookI (eastern Mosquitofish), and I've seen little white worms swimming in the gravid spot of some of them. The other day there were almost 50 of them at the bottom of my tank so I immediately did a water change and got them out. Any idea what they could be and if my fish are pregnant or just infested?

 

Welcome to fishlore!
If you could post a picture of the worm then it would be good.

Maybe some kind of planaria.

 

After looking at some pictures of planaria, that's most likely what it would be. They were about 3mm long and 1mm wide. So I think that's it, but now, how did they get there and more importantly, how do I get them out???

 

After looking at some pictures of planaria, that's most likely what it would be. They were about 3mm long and 1mm wide. So I think that's it, but now, how did they get there and more importantly, how do I get them out???

It has multiplied due to overfeeding and poor water quality.The main ways to prevent planaria is to not over feed and to gravel vacuum thoroughly and do many water changes and also to not feed the fish at all for a number of days.

 

Thanks but I don't know how gravel vacuuming would help since the worms are in the actual fish/gravid spot.