Get a gravel vac !
I do something similar with my 75 gal...
I mix up two pails of water and when I ready I use a third pail and siphon off two pails of old water (shut my pumps off of course)
Then I stack the fresh water on top of one of the empty pails and siphon the fresh water back into sump and turn the return pump on. I do this with both pails.
The siphone has an auto start mechanism so by shaking it up and down it starts on it 's own.
Works well and takes about 10-15 minutes, siphon was about $12 at LFS.
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75G, 100 lbs LR, Inwatter Stingray LED's, 25 Gallon Sump, 24wt UV, hermits, Snails, pep, fire & cleaner shrimps, Blue Throat Trigger, Perc Clowns , Yellow Tang, Coral Beauty, Blue Regal tang, RBTA, Coral Banded Shrimp, Checkerboard Wrasse, Many Corals, Royal Tux Urchin
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