Tonya,
There's no "formula" that I know of -- just simple math. If you put a
measuring tape up against a 55 gallon tank, you'll find it's about 20" high.
As most aquaria aren't filled completely up to the top, but are down at least
an inch to an inch and a half, there really isn't a full 55 gallons in
them, Then too, your gravel takes up some space that the water would ordinarily
take up. You probably have closer to about 50 gallons of water in the
tank. If you figure on the tank having 18" of water, figure that the 9" high
level will be 50% and the 13.5" high level will be the 75% full mark (if there
were no gravel). To make a 25% PWC (about 12.5 gallons), draw the water
down to about the 14" high mark and that should be close enough (depending on
how much gravel and rocks you have). At that same time, you would be
drawing out 25% of any salt you may have added, also.
Ray </HTML>
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We Thank You in Advance for Your HELP in this matter.
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