Automatic water changes on 25 gallon

[sammer]

I am considering seting up and automatic water change system for a 25 gallon tank with sump.

Would this be a really bad idea for a small system?
I would use my apex controller with float switches and temp monitors etc for the NSW bucket.

I would also use just two small pumps for adding and removing water (about 1 gallon per min)

Any thoughts

Thanks