lol, it's okay. If you can afford one, get a sump system; not entirely necessary, but it's pretty much the best you can get. Otherwise get a canister filter that can do at least 2 times turnover e.g your tank is going to be a 55g so get a filter rated for 110g or higher. I'm pretty sure you probably know about heater's and what not, so I'll leave that bit up to you. Go with a thin layer of sugar grain sized coral sand about 1.5" layer, it'll help in buffering your water. It is also a common believe that sand aids in the digestion process of cichlids; not so sure about that one though.. lol. As for when adding them to the tank, start with the goby, then the shelly/calvus combo, the cyps should be the last fish in the added to the tank. They are pretty sensitive to drastically changing water conditions, they have to be stable for at least 3 weeks; more comfortably around 6 - 8 weeks. The goby requires a special diet of mainly vegetable matter, i.e spirulina algae based products, just something to keep in mind.