Lighter rocks for aquascaping?

[LBDave]

Good question, also sounds like this might be good bio media if so.

I tried to look online but I couldn't find anything larger than a softball

I would be concerned about monster fish "road rash" during a water change!
You probably don't want to spend too much money but take a look at these. I just put some in new tank and they look great.
https://www.universalrocks.com/fish/rocks

 

[TwoHedWlf]

I know you can buy pumice for removing calluses and in construction we use it for cleaning rust off porcelain. It's abrasive.
Is this pumice you are talking about abrasive?

About as abrasive as any other rough textured rock. Rocks aren't really renowned for being soft...

This is it in the top left. Just a lump of pumice, it's been knocked around here so it's not sitting nicely...

 

[LBDave]

About as abrasive as any other rough textured rock. Rocks aren't really renowned for being soft...

This is it in the top left. Just a lump of pumice, it's been knocked around here so it's not sitting nicely...

Pumice is like sand paper. I wouldn't use it. That's me.