Haha, more lifting indeed. Then you have to carry into your house the cleaned out buckets of sand. I had an 80 gallon and my dad and I struggled with the tank and the stand. I couldnt imagine a 125 gallon. Wow
I'm going to suggest the opposite. I'd start with 100 lbs and see if it looks like enough. I have about 60 lbs in my 75 gallon and wish I had put less in. More sand=more area for pockets to build up and more need to churn it.