this was the most helpful thing i could find on keeping marimos in saltwater (waiting for mine in the mail) i will be keeping mine in with seamonkeys and i have a freshwater triop tank. do u know if they do well in distilled water? tried to send this to you in a private message but couldnt...this thread made me want to join!!! if i manage to keep these 2 tanks i have alive i will be trying my hand at a simple salt water tank anemones and clownfish...maybe a small peice of live rock!!! thanks for posting about the marimos!
Be careful buying live rock. You can make dead rock "live" with patience. Live rock from stores, like Petco, can carry lots of disease. Just remember something like an anemone needs a very established tank.
Personally, I would setup your saltwater tank with a couple pieces of dead rock. Maybe 1.5lbs per gallon. Take some pantyhose, put a piece of shrimp in it, and hang it in the tank. Just let it run for a week or two just circulating. Do a 50% water change and add some copepods. After another week, setup a separate small 10 gallon tank. Do a water change, but take the water from your current tank and fill the 10 gallon with it.
Throw some clean pvc piping in the 10g. Buy yourself a Clownfish or two, and throw them in the 10 gallon. This is your observation/qt tank. Follow the medication guide. There is a great guide to QT on the reefsanctuary forum.
Over the course of observation and QT, which should take about 6 weeks, you will then have an established tank for the clowns that shouldn't have a crazy ammonia shock.
After a few months you can think about adding a nice bubbletip anemone or something.
If you throw one in immediately it will die.
Good Luck!