Hi....again. As i mentioned before, I am new to this board. Hopefully I wont start to drive people insane with all my posts. Well i went out today and started to purchase items for my octo setup. Here is a list of what i purchased: well first i should just mention this is going to be a 55 gal tank. 1. 40 lb. bag of Carib Sea Argonite(sand) I hope this will be enough. 2. 15 lb. bag of instant ocean for 55 gallons 3. A deep six hydrometer (which although there is directions, i still have no clue how to use it. 4. A Seaclone 100 Protein Skimmer I still need to purchase a filter. I think i am aimming towards a canister filter. Can anyone recommend one for a 55 gallon tank? If any of what I bought does not sound like the correct item please let me know. Also please let me know if there is anything else that i will need to add to my list. Also I have a question about reverse osmosis water. If the pipes in my house are copper, will the RO system take out copper. Am I safe to use the water from my house. Thanks so much. Oh yeah, sorry for such a long post.