The cuc will eat leftover food I guess until the algea starts to bloom. But I wasnt adding them today,my ammonia is still showing. On another note....yesterday I resealed my 20 gallon and by tomorrow I should be able to add water to check for leaks and if all is good I can transfer everything from my 10 to my 20 & maybe turn my 10 into a sump refugium thing u guys talk about.