After a tank cleaning and water change about 2 weeks ago I noticed lil nitty worms on the glass, so I didn't feed the fish (they have hikari's cichlid gold) for a few days and cleaned the tank again, even took out the gravel and rinsed with warm water REALLY good. I clean it once a week and do at the least 50% water change, clean the fixtures,filter, and lids even add aquarium salt. There aren't so many in there now but is there anything else I can do. I heard that a betta will eat them but he will be eaten by the oscars, humm maybe he will survive if i get him a lil cave to go in.... or maybe a large apple snail?