3a : to place or invest in such a manner as to make unavailable for other purposes their money was tied up in stocksb : to restrain from normal movement, operation, or progress traffic was tied up for miles. 4a : to keep busy was tied up in conference all dayb : to preempt the use of tied up the phone for an hour.
A 20-gallon tank is the minimum tank size for a reef or saltwater tank. Although it may be harder to maintain than a bigger tank, it is possible to create a saltwater tank using 20 gallons. Be mindful of the fish stocking to ensure that too many fish do not over-pollute the system.
1 Roughly, salt water weighs 64 lbs/cu. 2  ft., as opposed to fresh water, which is about 62.2 lbs/cu. ft. 3  There are 7.4805 gallons in a cubic foot. 4  So a gallon of salt water weighs 8.556 lbs. Two pints to the quart, four quarts to the gallon means eight pints to the gallon, so a gallon weighs about eight pounds. 2  But that only applies to FRESH water. 3  Salt water has a whole range, depending on how much salt is dissolved in the water.