First welcome .I have found that even with a good pet store NEVER listen to thier advice .....They have to make sales , that is their lively hood .That is what these boards are good for we have nothing at stake and no need to push a sale ...Set up your tank , cycle it the only things that should be in your tank right now is :
Live Sand or sand (if it is not live it will be as the populations grow)
Live rock (this is a must)
and any free hich hikers that may have hiched their way into your syste
sit back and wait , your cycle is under way ....
Here is how your cycle will look
Ammonia will rise and fall to 0 . Ammonia is the most toxic to fish and will burn gills.
NitrItes will rise and fall to 0. NitrItes are the biproduct of ammonia less toxic but toxic none the less .
NitrAtes will rise and fall you will then do a water change at this point to drop them to lower than 20 .... This is the biproduct of the Ammonia breaking down to NitrItes, NitrItes then go to NitrAtes it is still toxic but less so than ammonia or nitrItes ...
Ph should be steady at 8.2-8.4 will be higher with the cycle of lights .
Spg should be at 1,024-1.026
Temp should not have huge swings and be at around 77*-80*
The cycle can take any where from 2-6 weeks to complete ...No fish are needed to cycle die off from the LR
is enough to kick start it if not add a table shrimp (unseasoned ) All you need is die off to start it .
Once complete you can add a CUC to help with the algea that will be there (also a biproduct of excess nutrients and the cycle )
These boards and folks are great and teach from experience of what works and what doesnt ...
As for fish you could place in a smaller clown , or even some gobies ... At most 2 fish as that will give you a fairly high bioload ....
Do remove the bio wheels once you are cycled as these tend to be nitrAte/Phosphate factories ....If you want corals you will need to upgrade lighting as this will not be enough for corals (perhaps a shroom or two) but that is about it .... Keep us posted keep the questions comming and again welcome