So as many of you know, I am starting my first aquarium. Its a 75 gallon with a refugium. Alot of you have been extremely helpful answering all my questions. Thank you! My next question is about money. I obviously know the start up costs, (I've been hiding that from my girlfriend. I just show her the pictures not the price. ) What about day to day cost? How much do you think it will cost in food, test kits, salt, stuff like that monthly once its all set up? Any ideas? Also what are some hidden costs? Like for instance calibration fluid when I get a refractometer? Thanks again for all the help everyone.