Weird thing in MY TANK

I dont know much about skimmers, so hopefully someone else can help you with that. But that is a good powerhead, you will need a few though. And I would buy the testing kits new because they can go bad, and I would want to check that before I purchased a kit.
 
that heater would be fine the first powerheads that you posted will be fine only thing with those is the suction cups have a tendancy to loosen so just keep an eye on them, like Hannah said 2 will work for you.. That skimmer I wouldnt waste the money on, get yourself a descent skimmer you will be happy you did..
On a 55 gallon I would have no problem using a light like this one just make sure to change out the bulbs ( not many fixtures come with descent bulbs)..
Odyssea T5 Aquarium Lighting
aquatraders has become a much more descent fixture for the price..
 
What about a air pump?? is it good for a saltwater??

And little_fish, the API test kit is 30 day money back. So if it is out of date i can send it back!!
 
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