They are very very very small (about the size of a quarter) and they require live baby brine shrimp several times a day, which means you need to have several hatcheries running at all times. They also require very frequent water changes. I think that many people with zosterae do water changes more than once a week. If you are willing to dedicate the setup to them (no other fish, etc.) and feed them several times a day, and hatch brine several times a day, then go for it, but if you are looking for something easy, I'd skip them.