i have a new tank and im cycling it for a week right now. i have a external canister with stable BB on it and i have use purified water. i put some powdered fish food for hasten the cycling and now i can see some white worms coming out from my substrate. still im on the process of cycling no shrimps yet but how come these worms came out from my substrates. i have fondo vivo bottom layer and jet black gravel upper layer. pls help me confirm if its benificial or it will affect the shrimps health. thanks.