You said you just added 2 new pumps. I would go through every piece of electrical equipment you have and add up the maximum wattage for each device. It's quite possible you are against the limit for that power strip, outlet or the wiring or all of the above. If you are anywhere close to 1300-1500 watts you need to look at getting another circuit put in or bringing a heavy extension cord into play from another circuit somewhere else.
After doing that I would VERY soon (like tonight) and VERY closely investigate with your nose where there is lingering electrical smell. You said there was a smell when this happened. Whatever tripped the breaker in the first place may be damaged and barely holding on and likely to fail again in the future. It could be a simple electrical arc smell but if there are burned contacts somewhere that can cause problems in the future also. Look at all your plugs, controllers, strips, etc, etc and look for melting anywhere on the device. This will likely be on the back if present or around the prongs on the plugs.
Definitely look closely at the new power strip. Anything new to the setup is suspect in a previously stable system. Is this an Amazon special without UL certification? Some of the electrical stuff online is pretty shaky when it comes to construction and personally I don't trust most of it.
Good luck!
