I have had an on and off problem with detritus worms for a while now . I wipe them off the glass, do a water change,they are gone for a few days and then come back. I dont do regular water changes on this tank because its only 2 frogs in a 5g tank with a bunch of plants and they dont eat that much ,so i tend to let the plants amd filtration break down the waste and only change water when it needs to be toped off every 3-4 weeks . I will take out enough water so that I add about a gallon of fresh water when it needs to be toped off. Since the worms were so out of control this time i did an 80% water change, wiped down all the plants and caves , stired up the sand, cleaned the sponge filter, and added an hob filter. The frogs seem quite stressed now im hoping they will be ok. Last time I did such a major tank overhaul was when I moved the tank about 18 months ago and they are like 5 so pretty old for ADF. Hopefully the worms are gone for a while but well see