Water Changes When Nitrates consistently read zero?

[mark]

Water changes are a bit of my own made hassle as when I do them, I siphon out ~15g from the display to get the detritus that collects in the corners of my BB and the remaining 10g from my basement sump/fuge.

If I just did water change from the sump only, it could be a 5-10 minute job. Other than leaving the sediment in the display (which really isn't that much) any negatives. It would save me from having bring upstairs the waste barrel and dolly, carting the 15g to the main floor bathroom tub, clean up, etc.