Hi everyone ive been interested in fish for a few yrs now owning 3 tanks 2 are tropical. I have a 6ft tank with an Oscar and friends. I also have a 120l tank with a blue crayfish in. My third tank which is a 240l used to house malawi cichlids. I decided now ive been a succesful tropical fish keeper i fancy trying marine....My tank is still in the cycle part. all the live rock,sand is in. my lfs also said adding a fish would be fine so ive added 1 percula clownfish which is doing great....i will start to add more in a few weeks.... Not rushing into it...this forum has some great info....The only thing im not sure on is I buy my water instead of making it myself....and the salt water is in one container and the r.o in another.....how long does these waters keep in a sealed container.......thanks for any answers.....stu