Equipment ideas for future 29 gallon saltwater tank.?

I have a 29 gallon aquarium that I plan on using as a saltwater tank. Right now, it has

1x Tetra submersible heater
1x Aquatech power-filter 20-40
1× thermometer Tetra
and 1x Aquatech Regent Powerhead for flow

Any ideas on equipment, including protein skimmer

Punkin eater2016-05-22T12:01:08Z

Equipment ideas:
1. Get a good book
2. Get better equipment in the future, cheapest stuff won't be any good

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