Fig. 50. Halimeda cultures in glass aquaria, showing arrangement of lights and aeration 

 system. Compressed air is filtered through glass wool (m tube at far upper right) 

 and enters a manifold (suspended from top shelf). From there is passes through 

 Teflon tubing to a bubbler in each aquarium. The rate of flow to each aquarium is 

 controlled by a tubing clamp. Arrangements similar to this can line the walls of a 

 controlled environment chamber. A Udotea plant is in the left-hand corner of the 

 middle aquariimi in the upper row. (From Colinvaux et al., 1964.) 



