There are a lot of barely used generators still for sale on CL or Letgo. Many Floridians bought them for hurricane Irma and they are still selling them.
You want a generator that will more than power your setup. What pumps and heater/chilled do you have running? In years past I've used a Troy built 4750 watt and it handled my 155. You will also want power for your fridge and a fan or too. I would recommend at least 4500 watt and up to make sure you have enough power.