and turn whatever HOB you have now into a pothos plant filter, takes care of nitrates nitrites and ammonia, not to give you an excuse to reduce water changes but itll help!!!!!!!!!! trust me!!!!!!!!!, just go to food lion, food city, kroger, even walmarty and but a "pothos" big bushy full one,.. pull it out of the pot and rinse all the dirt off the roots, then take the catrage and bacteria bed out of your current filter.. throw a handfull of rocks from you substrate in there and... BAM!!! yoyuve got a filtration monster!!!