Review on Marineland Rite Size Cartridge B 12 Pack by Michael Cox

I have brought this product before and it was great. I had to buy more because I ran out. I usually change the filter every week. However, when I brought these new ones, I have to change them every day. I notice that a thick white mass is now coming into the water. I don't want my fish to get sick so I take it out every time I see it starting to happen. I don't really know if it will harm my fish, but change it immediately anyway. Never had this problem with this cartridge. So with these new ones I brought I'm keeping an eye on it. If not, I'll see if there's another brand.