Hi all,
Today I found there are some very fine white worm moving within the black mud. I can't catch them because they are moving quite fast and in very fine size, I guess there are many because I can only see the tank sides.
I search the old post saying that it is caused by too much fish "see". Now I have
planted many hair grass and "needle crown". I really can't suck the fish "see' through out the whole substrat area. What should I do? Do they really not harm? Do they reproduce fast?? (if fast, that's horrible, many many white worms moving all the way!!)

i have added much snail solution!! But seems can't kill
Please help help!!