I had a bad detritus problem in my 5 gallon when the fry were in there. I figured because of no filtration and live plants. I netted them a few days ago and moved em to my 10 g. I have a sponge filter that is rated for 5g in the 10g with the fry, waiting on the bigger sponge filter to come in. The adults breeded again in the 10 g before I moved them back to the 5 and now I have over 100 fry in there. And now I'm seeing detritus worms on walls again. I guess maybe because of poor filtration? Maybe from netting babies out of the other tank I brought some worms with them? Or maybe they are growing because of dead fry under rocks that didnt make it out or something? Idk what to do. Guess I'll vacuum it for now.