Yes, tanks can leak. But as Lilibeth said, if the tank is sealed well and is kept level, and supported correctly (under the edges I think is what tanks need most, due to the way the seams run--support in the middle doesn't do much for a tank), there is a much lower chance that they will..
Consequently, why do aquariums leak?
For leaks, most are usually caused by a flaw or failure in the sealant, either generated during the construction of the tank or over time becomes weak and begins peeling away from the glass.
Also Know, how long does it take a fish tank to leak? If the tank is not leaking after 24 hours, then you should about double the water volume in the tank. Now that the tank is about 1/2 full, again let it sit for 24 hours or more and check for leaks again.
Consequently, can you fix a leaking fish tank?
Leaks along the seams of your aquarium are relatively easy to fix because they are usually caused by a failure in the silicone, and silicone can be easily replaced. However, if the leak is due to a cracked side or bottom of your tank, that is not as easy to repair.
Can a fish tank explode?
Generally speaking, if your tank is level and straight it takes some pretty good knocking before it will crack and "explode". Unless the glass is defective or the silicone seals are bad, a tank should never explode unless it is mistreated in some way.
Related Question Answers
Do acrylic fish tanks leak?
Aquarium cracks, chips or leaks happen more often to glass aquariums rather than acrylic aquariums. Acrylic aquariums are often advertised as lightweight and crack and leak resistant. Acrylic aquariums have more clarity than glass, are lightweight and are stronger.Should I reseal my aquarium?
The short answer is no. Repairing the silicone seal on an aquarium is a recipe for disaster. The amount of work to correctly repair the silicone seal is almost never worth your time and suffering. Unless you have a lot of patience and the correct supplies, resealing aquariums is best left to the professionals.When should you reseal an aquarium?
There is no need to reseal your tanks every 5 yrs.Can an aquarium overhang the stand?
any double based tank should be correctly supported across the whole base! regardless of any overhangs. overhang means nothing, and by how much again means little with the only exception here being that that supporting stand (overhanging or not) can properly support the tank long term without movement.Can I use flex seal on an aquarium?
Q: Is FLEX SEAL® LIQUID safe to use on a fishpond with live fish? A: Once fully cured, FLEX SEAL® LIQUID is safe around plants and animals.What is the life expectancy of a fish tank?
In general, the life expectancy of a saltwater fish is around 20 years. Freshwater fish tend to live to about 15.Can you use regular silicone to seal a fish tank?
Aqueon Silicone Sealant Aqueon's silicone sealant is 100% non-toxic silicone. It's really easy to apply and creates a permanent, high strength seal to stop and repair leaks. Over time, it won't crack or shrink and because it's non-toxic when it cures, it's safe for any aquarium and all fish.Will Flex Seal cure underwater?
A: Yes, you can apply Flex Glue underwater and it will even cure underwater. Q: Can it be used as a sealant? A: Flex Glue is an excellent sealant. It can fill large voids and is great for applications with uneven surfaces.What do you use to seal an aquarium?
Silicone Aquarium Sealant is ideal for constructing or repairing small aquariums. The 100% silicone-rubber formulation provides a waterproof seal that won't crack or shrink. It is non-toxic when cured.Do fish tanks break easily?
Although aquariums don't break easily, they can be broken. Take care when moving glass aquariums, as they are heavier than you might think. Never move a tank with anything inside, partially filled aquarium, as the risk of accident increases.How do you do a leak test?
The leak test is performed by immersing a part, usually a sandwich composite structure, in a hot water tank. The temperature of the water induces the expansion of air in the structure, and if a crack or a delamination is present, gas bubbles escape the structure and are immediately detected by visual inspection.How do you tell if a tank is for fish or reptiles?
if the stains are 2-3inces by the top it was used for fish. If they are midway then probably turtles or frogs. reptile tanks most will have screen tops,no water stains, and a pretty cruddy bottom. but most people are pretty honest.What happens if aquarium glass breaks?
If a pane of glass shatters, it's likely that all of the contents, including water and fish, will spill out. However, if the break is just a crack or is up high enough, it's possible that some of the water may leak out but the fish could survive the event if enough water remains in the aquarium.How strong is aquarium glass?
Testing samples show that the tensile strength runs from 19.3 to 28.4 megapascals (measures pressure forces). Due to limitations in the glass manufacturing process, the strength of glass can vary, which means a suitable safety factor must be used when calculating glass thickness. The commonly used factor is 3.8.Will a fish tank break in the cold?
Cold water is no problem, but it can take quite a while for the aquarium heater to bring it to the correct temperature. You can also use one of the bulkier, more stable pieces of aquascaping -- a rock, for instance -- to break the flow of the water.Can I use a reptile tank for fish?
Reptile tanks are not suitable for fish. They're not waterproof and not as sturdy as fish tanks (the glass tends to be thinner and the sealing isn't waterproof). 
