"David C. Stone" wrote:
The flip side is that the volume of water needed to reduce nitrate
levels through water changes is slightly more than double for a 55g
versus a 20g tank - much more work unless you have everything plumbed
right in. I have a 130g tank here, and a 10-20% water change is a
BIG job!

Get a python water remover/replacer - its a doddle!