hey Teelie, well let's see.
Tank set-up:
-All sounds good
-Lightning is very important depending on what you want to keep, for fish only 2 tubes will be fine, say a white bulb and a blue bulb (power-glo & marine-glo) will be just fine. So no need for nothing special.
-Unless you want to keep corals, you then will/must get a metal halide of at least 150W and if you want to see the glowy colours of the colours add a blue bulb. I would say though, it's best if you have a fish only with live rock first and then later on when the tank is more settled think of having a reef tank. It really isin't all that hard it just needs looking after.
Per example, I have a sun coral which I feed everyother day, that means taking it out and putting it in a bowl and feed each polyp (around 50) this takes me about 40-60 minutes. Then I have to feed my anenome and my plate coral by hand as well. All the rest feed on phytoplakton etc.. so they are easier.
Filtration:
-A skimmer is a must, but you already mentioned.
-Not 100% on this one as I dont have a sump. Some one should be able to help on this one.
-It's alwasy usefull, specially if you want to add things like rowaphos(phosphate remover),etc.
Fish:
Sounds good
Inverts:
-Okay the sally crab might not be a good idea, here's why.
The Sally Lightfoot Crab is also known as the Nimble Spray, Short, or Urchin Crab. It has a brown body, with orange to yellow rings on the legs. It actually belongs to a family of shore crabs, however, it is less likely than the other genera to go on land. Its carapace is very flat. which allows it to hide in small crevices within rock work.
It prefers a strong current and will require a large aquarium with large amounts of rock work where it can hide and scavenge for detritus. It will also eat algae. When large, it can become aggressive and catch and eat small invertebrates and fish.
If insufficient algae is present, its diet may need to be supplemented with dried seaweed. Meaty items should also be offered.
So it might later on become dangerous to your tank inhabitants
.
-The Long Spine Black Sea Urchin will be okay, but they get HUGE, should be fine, but they take alot of space. Good algae eaters, but nocturnal so you wont see much of it at day.
-Turbo Snail , you will need lots of them, alot more than 3 for a 50 gallon. not sure on the rules for these ones but I think is about 1 per gallon or something like that. I personally dont like seeing to many snails, but they do good
.
-Cleaner shrimp, definitly good really. They will set a station where they will remain, and also in their station if a fish aproaches it will attend to clean the fish from parasites etc.. just like the one from finding nemo
.
- Blood/Fire shrimp, good guys but best kept in at least a few say 3. They are extremely shy and unless their is more of them in the tank you wont see him at all. Same applies for the clear shrimp
.
- Starfish, theres quite a few that are nice. I personally have 1 at the moment, but looking into buying more. I will definitly recommend the sandsifter star, it does wonders for the substrate. It aerates it and also as it moves it around it's good for the tank. Their is also the red starfish or the blue one, good at cleaning the algae from the glass.
Coral & Everything else:
Corals(inc. anenome), see above
Hope it helps and sorry it's so long 8)
