I have a 90 gal tank, and I have been thinking about setting it up for salt water. I have a wet/dry for up to a 300 gal tank,proien skimmer,heaters,and air pump. I have it up and running for fresh water but Im thinking about going to a salt water tank. Do I have all the equipment needed to swith? Also another problem I might have is my house is heated by hydronic heat (water tubes running thrue the floof). So it is extreamly dry. I loose at least 1 gal. a day of water in the tank. Will the salt evaporate with the water or would I just have to keep the water level the same. If I would have to add salt and check the content every day I will have to stay withfresh water. I have it set up with a plunger switch in the wet/dry to automatically fill the tank daily-with filtered water. I also have a 280 gal, but I wanted to try a salt water tank with the 90 gal because of the cost of live rock, coral, and fish.Oh-also a have the lid with 4 floresent lights. Would I need to change the floresent bulbs, or I aslo have a 600 watt mtal halide growing light would this work better? SORRY about all the questions, but this is all new to me and I want to do it right with as few problems as possible.