Fishanatic
Aquarium Advice Addict
I wouldn't doubt it. Check you're box for exact volume information. Most of the time, 20 gallons are actually 18 or 16 gallons. And also, you don't fill it up to the top, so you have to count that too. Overall, 4 gallon change should be around 55 percent.I have a three gallon bucket that I can "safely" move 2 gallons at a time. If I remove two buckets
(4 gallons) I only have about 3" to my rocks. So that should be somewhere around 60-75%. I have a 10 gallon tank, do you think I am doing more than 50% at 4 gallons?
Btw, in the previous post, when you asked what would be too toxic for the bb, I said 10ppm. Never let it reach any where close to that. Anything over 1 will be additionally toxic to the fish.