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Hey guys! First post here and I must say there is quite a bit of good info on here. But as the title says, I'm completely new in the saltwater game. I do have quite a bit of experience in freshwater fish and especially freshwater plants over the years. (I know it probably doesn't help much lol) But I recently just received a drilled 55 gallon from one of my family members for free. So that being said, I could use all the info and help you guys can give me. Here's what I'm looking at picking up now. Let me know if it's a good idea, or a mistake lol...... It already has an overflow box pre-installed (My cousin said he installed it from a kit). I was looking into getting an Aqeon Proflex sump system and adding a skimmer from SC Aquariums that I've read really good reviews from. The thing that kind of confuses me though is the flow rates. The overflow box is 700 gph and the sump would be rated up to 1000 gph. So how powerful would my return pump need to be? And also, would a refugium be necessary? And as for lighting I already have a quad T5 HO lighting system with a built in timer from my freshwater plant days that I plan on switching out the bulbs for 2 10k and 2 actinic. I plan on doing a 1 inch sand bed and I plan on using 20 percent live rock and 80 percent dead rock for the cycle. My questions with that is, would I be able to eventually graduate to growing corals with my lighting setup? I also have no idea of what fish/inverts to put in it, which i need advice on lol. I also planning on picking up an RO unit instead of buying it the from the store.. I also plan on picking up the salt mix, refractometer and all the other supplies online. if I'm missing anything please let me know! Thank you guys.