Hi, my wife and I had a marine tank 10 years ago and I have forgotten almost all of what I learnt back then. I have just bought a second hand but immaculate fluval M90 tank and just starting out from scratch with it. Comes with a skimmer and whatever else it came with from new I’m not adding fish until I get it all set up and the water is spot on. Iv got 20kg of healthy mature live rock on its way from a reputable local suppler. Just scratching my head over RO. Do I buy the unit to make my own or do I use a product solution iv seen YouTube you just add in? Nightmare I’d rather come here where the real experts gather. We don’t have a local place that it would be easy for me to buy RO water that’s my dilemma. Anyway hello and apologies for the trillion questions I’m about to unleash. Looks like a cracking forum I’m looking forward to spending hours reading posts to REEFresh my memory see that my jokes are as bad as my aquarium understanding.