2 manual water changes 1 device?

[WhitePanther93]

I use a Neptune dos to do manual water changes. Usually I do 10 gallon changes.

Would it be possible to set up 2 different water change amounts with the same dos? For example would I be able to make feed schedule b do 10 gallons while c could do 20?

Or would I be stuck just using the task every time I want to change water amount?

 

[exnisstech]

Can't help but here's a bump