Okay, so I have a 50 gallon tank that I used to use for freshwater, but then I got my 60 gallon so it's empty now. I've never done saltwater before, but my mom kept going on about how she wanted "little Nemo fish" and seahorses. I know it'll be a while before seahorses would be safe to add. My mom is visiting her sister for 4 months though so I wanted it to be a welcome back gift. I know you need live rock, but it's wicked expensive. I read that dry rock turns into live rock if you put it next to live rock, is this true? Also, how much of each rock would I need? I also need to know the basics on how to get it set up really nice and what needs to be done before the water is stable enough for fish and established enough for seahorses. I'm also not sure what a protein skimmer is and what it does. Any info would be helpful, thank you!