04-07-2010, 09:58 PM
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i can say your off to a good start as a 75 gallon is a wider tank which makes placing rocks easier however that was one of your cheaper purchases. a skimmer is going to be needed which for a quality one, it can be pricey. ( there can be deals found on craigslist or a local reefing club, but you dont want to skimp on the skimmer, period. ) you'll need powerheads, heaters, enough live rock, sand, refractometer, lighting depending on what your keeping, a salt mix, liquid test kits for amm, nitrite,nitrate,ph,temp,mag,ca,alk at the minimum, a few other odds and ends, and then youll even need a sump for the skimmer to sit in ( which that 20 L you have would make a decent DIY sump )
what im trying to say, before you begin, realize this will be an expense which will be a long term investment.
im by no means saying you cant do this, and even though you have the tank your still far off from having a tank. research should be done on everything and anything saltwater related. ask questions, read other peoples tank threads, look in your area for a local reefing club and so on.
to answer your question about tinkering and being more work then freshwater, yes it will be atleast at first until you get used to what your doing and things mature.