N.A.T.O. The defensive military alliance formed in 1949 by ten european countries. WARSAW PACT A military alliance formed in 1955 by the Soviet Union Netherlands. Norway.
Tank Rings. Tank rings filled with gravel lift the tank above the surrounding grade. This keeps the tank out of standing water and increases the life of the tank bottom.
Feeding Rings. 1  Feeding rings are plastic rings that are used to keep floating foods in one spot. This cuts down on mess, but unless all the fish in the tank are peaceful and feed well together, it is better to let the food spread over the whole surface. 2  Worm feeders are usually often cone-shaped.