No more holes needed, and BTW congrats for having the guts and determination. I wish I could walk you through all of this, but there is an incredible amount of information on the web that you can research. Saltwater really isn't that different than freshwater, one of the major benefits that SW has over FW is that SW allows you to create very small bubbles of air, this allows you to extract compounds from the water that are next to impossible to remove from freshwater. Once you start reading about the principles behind protein skimmers (foam fractionaters) you'll know what I mean. I have a pretty similar background, 18 years of freshwater, and about a year of saltwater, to tell you the truth, I think saltwater is easier, It's been a year and I've never had a problem in saltwater. In freshwater, I at least have a case of nipped fins that I need to attend to every once in a while. Saltwater, nothing, no disease and the water is always crystal clear. It's funny because the only reason I avoided SW for so long was the misconception that it was difficult. It isn't, but you need all the information you can find, so read up, it's free and waiting on the net. Another note, if you aren't getting the search results you want, try this search engine
http://www.ixquick.com