Photo: What are these things?!

After siphoning and adding new water to my tank, I found about 3 clusters of these very tiny white worms. WHAT THE HELL ARE THEY!?!?!?

Hi Abberzoo,

They look like planaria.

For tactics on dealing with tank critters such as planaria (and other tank invaders), I would recommend you have a read through this article.

Hi Abberzoo,

I agree with Jacq that they look like planaria. In most instances, you can just leave them be and they shouldn't be a problem. If they bother you, you can try reduce their population by ensuring you keep your tank free of detritus, uneaten excess food and such. If you notice the planaria are having an adverse effect on the axies such as witnessing planaria attached to axie skin and gills causing obvious discomfort to the axie, then eradication is indicated.

You can choose to bait planaria. Scraped beef is put into a gauze sac and hung among plants and close to the gravel. Light should be switched off. The gauze sac will attract Planaria that will gather on it in a few hours. The sac is removed from the aquarium (hold the net under the sac to prevent Planaria falling back into the aquarium) and put into boiling water. Repeat this for several evenings to ensure that young planaria that have hatched from eggs are eradicated.

Here is a link to another discussion post i had sometime back on planaria.
http://www.caudata.org/forum/showthread.php?t=58702&highlight=planaria&page=2

Cheers.