If you do daily water changes, you don't need filtration. Just make sure you use dechlorinated water for the changes. My tap has ammonia so I also use AmQuel in addition. I keep a 5 gal container with pretreated water set aside for the water changes. I keep one empty container, put the desired amount of water in it, use a net to dip out the little one, put him in the new container and dump his out. I continue the cycle til done. That way, it's pretty non-traumatic for them until they get larger, say around 2+in, then you may want to set them up in the 10 gal tanks. They could go 2 per tank if you use a separator. I have 2 per 20 with separators and use a Tetra 3i in each. I only do partial water changes as I vacuum (very carefully) their wastes out. So far, all are thriving and now since regenerated, they are growing well! Good luck!