Im sure your fine with what you have. Im running my lights power heads pumps heaters fans ect as well as 2 computers tv large stereo more and more lights.
I also moved the treadmill over one day and the breaker only tripped when I was maxing out the treadmill with the stero pounding.
As others have said its prolly a good idea to get some sort of gfci protection in there.
*installing a gfci recepticle will protect everything else down the line from it.
*good idea to have it on 2 different circuits so if one trips youll still have some motion and or heat getting to the tank.
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