I've got to agree with the dog pic
They either look guilty, or they are saying something to you about your build
Coming along nicely - good work
About your electrical;
Yes, 12 'sources' per breaker is the limit. They all count ... lights, outlets ...
This is code for a 15A circuit ( basically )
Would be best if you could find a way to run 1 or 2 new dedicated breakers for your tank
I have one 15A for my sump, and another for my tank
The pumps/heaters/controllers all run on one breaker, and the lights/vortechs run on the other