Newbie 75 gallon

[gregzz4]

Originally Posted by Llorgon

I should definitely grab a grounding probe at least.

Nu uh. I wrote 'not' to use a grounding probe without a GFCI!!!
Breakers are only meant to trip when they get hot.
A GFCI senses an imbalance between line and neutral and only then does it trip. This will protect you if you stick your hand in the water.
Only having a ground probe will cause any stray/induced current to flow because you're giving it a path. Now when you stick your hand in the water you'll get zapped.

Either use just a GFCI, a GFCI and a ground probe, or forget I said anything and use neither.