watts are simply amps x volts. Usually you only want %80 continuous load on the circuit. So...20 x 120 = 2400 x .8 = 1920. So yes around 1900 watts is safe for a 20amp circuit.
If you are fine with the way the electrial works at the moment and just want the protection of a gfi at minimal cost you could just install the GFI recpticle where your fish tank is all plugged in.
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