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.
The huge exhibit tank is 28 feet tall, 66 feet wide, and holds 330,000 gallons of seawater. A constant supply of seawater is pumped into the tank from the bay. During the day, the water is filtered and clear so that visitors can view the kelp and various sea creatures.