What size tank is it and who is the manufacture?
Assuming it is not a tempered aquarium it is not too hard to do. You will need a drill press and a bit specifically made for glass. The typically done "drain" is a 1" bulk which needs a 1 3/4" hole. THis is a standard size hole that can be bought at some glass shops and at many aqua culture related shops (aquatic eco systems for example) There are two typs that are normally offered, a diamond bit type and a bit that uses a carbide slury. The diamond bit is quicker at drilling the hole but is more expensive than the slury type. Either way, you must use a press to have a straight, stable cut. You can not safley do this with a hand hold method.
THis is a very quick overview of this subject but if you want addational info, I can help. I have litterally drilled 100's of tanks.
Local glass shops typically won't touch aquariums, they seem to be scared of them.
Joel
Assuming it is not a tempered aquarium it is not too hard to do. You will need a drill press and a bit specifically made for glass. The typically done "drain" is a 1" bulk which needs a 1 3/4" hole. THis is a standard size hole that can be bought at some glass shops and at many aqua culture related shops (aquatic eco systems for example) There are two typs that are normally offered, a diamond bit type and a bit that uses a carbide slury. The diamond bit is quicker at drilling the hole but is more expensive than the slury type. Either way, you must use a press to have a straight, stable cut. You can not safley do this with a hand hold method.
THis is a very quick overview of this subject but if you want addational info, I can help. I have litterally drilled 100's of tanks.
Local glass shops typically won't touch aquariums, they seem to be scared of them.
Joel