07-06-2012, 08:36 AM
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Welcome to TFK and the forums first of all
The holes are for bulkheads, the ones in the bottom for draining the water, the ones in the sides possibly either for return or for water changes.
You will need to get a bulkhead for the size of the hole you have, the size of the hole is a lot larger than the size of the bulkhead you will need. Once you have the bulkheads you would then connect PVC piping or plastic tubing to the bulkhead.
These tanks would be used in a sump setup, where water will drain from the main tank into another tank underneath.
If you dont intend on using them this way, then you can have glass cut for the holes and simply silicone or glue them in place.
Last edited by Tazman; 07-06-2012 at 09:20 AM..