I use to maintain personal tanks only. Charging 50 to 100 per hour depending on what was needed. 50 just for water change. But if tank was larger that price went up. But that per hour price included what would be considered weekly maintence. Most customers were high end clients that didn't care much other than it needs to look good when company came over. I also never was asked to do fw
so not sure about that.
Also Ihad a 100$ initial visit that included testing and comprehensive work up. Then would set prices accordingly.
My wife became a hospital executive and the hospital wanted 300 fowlr
tanks. So I got the contract (wonder how) and had to give up residential. As the hospital bacame a full time job. My friend and I co-owned the business and had 5 employees. Commercial paid way different than residential. Companies that big wanted a price per tank and that to include fish. If a fish died it was to be replaced with same fish of equal size. It got unfun real quick. I sold the contract last november and will start residential only again.