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Before you attempt to repair the hole, make sure you have a holding tank for your fish. Fish will not survive in a bowl for the amount of time it will take to repair the tank. You will need to let the repair sit for at least 2 days. So, make sure you have a holding tank ready to go, with the correct pH for your fish. It would be horrible to fix the tank for your fish, then harm him or her, by the transition.
Once you place your fish in the holding tank, remove the water from the main tank. Clean the inside and dry it off. If you just have a leak, follow those directions. If you have a larger hole, follow the directions under number 2.
1. Leak
To repair a leak buy some asphaltic aquarium sealer. It is easy to use. All you have to do is apply it over the place with the leak and let it set for at least 2 hours. While this should work, it is best to test it out before putting your fish back in the tank. Just run some water over the area, and make sure the sealer worked. If not, you might want to move to step 2. If it did work, remember to take the same precautions you did in making the spare tank. Change is not easy for a fish. So, prepare your old tank well, and make sure the water is back to the same pH.
2. Hole
If you have a hole or large leak, you will need to replace this entire piece of glass. Go ahead and break the glass and remove it apart from the others. Have a new piece of glass cut to size. Mix 100 percent Portland cement with linseed oil. This will give you a thick consistency. Roll this mixture into the bottom of the tank along the new piece of glass. Then, roll it onto the tracks on the sides. Make sure you have a solid seal between the other pieces of glass. Let the cement dry for 1 or 2 days, then trim any of the excess cement off the glass. Clean the glass thoroughly and let it dry.
Now it is time to test out your new tank. If it works, you can carefully put your fish back in their original tank.