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There are many ways to set up a tank. You would drill holes in a tank if you have an overflow and a sump. Here's another example: I have a 120 gal that overflows into a sump through a filter sock. All the equipment for this tank is in the sump or cabinet. The equipment is a skimmer, heater, filter sock, return pump, an auto top off, a carbon reactor, and a kalkwasser reactor. The only equipment in the tank are two wavemaker pumps. It has an eight bulb T5.
This tank is also a very simple set up. Tanks can get very elaborate with equipment - dosing pumps, calcium reactors, biopellet reactors, etc., etc.

