The cleaner packs are way overkill, IMO. You are better off buying your CUC individually as needed from your LFS. This way you can tailor how many as well as of what type depending on your tank needs, your feeding habits, the bioload, etc, etc, etc. It may look like the packs are a volume bargain, but not if half to two thirds die off from starvation or just being the wrong type for your tank.