Welcome to AA.com! This sounds like a fish only set up? You can certainly keep clownfish in this type tank. If you want to keep shrimp in there, I would suggest doing a FOWLR
tank where you are using LR
as the biofilter. I would recommend about 90lbs of LR
and a protein skimmer to start with. Probably, for this size tank, an Aqua C Remora with a MJ1200 would be sufficient as long as you don't put many fish in there. You'll need to upgrade your lighting in order to keep the coraline algae on the LR
alive and growing. You'll want to do some reading before you start this project as well. I would recommend "The Conscientious Marine Aquarist" by Robert Fenner to start with. This will give you a good overview of the different types of SW
tanks you can do and what you'll need to do them. I think the anemones are something you'll want to wait on. They are difficult to keep and require very high levels of light.