I have a 200 gallon fish aquarium that has to be re-sealed along one of the edges and I need to know what kind of material to use to ensure that the it will hold. I plan on attaching an L shaped border to safegaurd the seal. I recently re-sealed the edge by removing the old sealant but a couple of days after filling the tank with water it busted and the water leaked every where! The problem area is not a crack in the glass. It is where the glass meets at the bottom edge that needs fixing.

: You could but a few shrimps is all you could keep in there and it would be a very small marine tank .An experienced fish keeper could mange that but i always advice 30 gallons minimum for starting a marine tank .

9.31 US Gallons

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Siamese fighters, also known as Siamese fighting fish or bettas, are colorful freshwater fish with long, flowing fins. They are known as hardy fish, and are relatively easy to care for. These fish can be aggressive, and two males kept in the same aquarium will often fight each other, hence their name. Because of this aggression, breeding bettas can sometimes be a bit tricky. Care must be taken to ensure that the female betta is not injured. However, when the proper steps are taken, breeding Siamese fighters can be a success.

Set up a breeding aquarium. This aquarium should be small, only 10 gallons, and should have only about 6 inches of fresh water in it. Place tall plants in the aquarium. These plants will provide a place for the male to anchor his bubble nest. This nest is where the eggs will be kept once their laid. You can also provide an artificial anchor, such as half a styrofoam cup, if you feel it's necessary. Place a thermometer in the breeding aquarium and monitor the temperature of the water. When breeding, Siamese fighters prefer a temperature that hovers right around 80 degrees Fahrenheit. Place a divider in one side of the aquarium. This can be a regular aquarium divider, or a glass chimney. The divider will protect the female from the male until their ready to breed. However, the divider should let the male see the female, so that he will begin preparing to breed. Find a healthy pair of bettas. Male bettas usually have longer fins that the female fish. Males also tend to be more colorful than the female bettas, which can appear somewhat washed out. Place the male in the largest part of the aquarium. Place the female behind the divider. Condition the fish, preparing them to breed. Do this by feeding both the male and female fish live or frozen, then thawed, meaty foods, such as brine shrimp or bloodworms. Observe the fish. When the male is ready to breed, he will begin to construct a bubble nest. This nest will be clearly visible at the top of the aquarium, and will be several layers deep when it's finished. When the female is ready to breed, she will display dark bars along her sides. A white breeding tube will also show under her pelvic fin. Release the female into the main part of the aquarium, with the male. The male will chase the female around, and may bite or nip, in order to entice the female under the bubble nest. The male will then wrap around the female, squeezing until the female releases the eggs. Remove the female as soon as the spawning is over, or the male may kill her. The male will continue caring for the eggs, and later, for the young fish, until they are free swimming.

Facts Sheet: How to breed siamise fighting fish
http://aqualandpetsplus.com/Betta, Breeding basics.htm More information on Siamese Fighting Fish http://animal-world.com/encyclo/fresh/anabantoids/bettas.php

on this tank the lights are built into the filter pump housing , if they go bad it might be possible to retrofit a new sealed light bar into the same space , but you will need to have previous knowledge of electronics and specify L.E.D. lights as they don't work like regular light bulbs but require a special kind of power or will be damaged if hooked to wrong type of power I suppose its possible to use batterys but id have no idea how long that would work

Only real way is to empty and clean and dry the tank and stand on tissue paper and fill very carefully, then wait till you see the tussie getting wet, then give that spot a good sealing.

There are some limiting factors like the oxygen availability and the filtration processing. I gave you some examples below they all refer for small or large freshwater fish.

3 cm of adult fish length per 4 liters of water.1 cm of adult fish length per 30 square centimeters of surface area. 1 inch of adult fish length per US gallon of water. 1 inch of adult fish length per 12 square inches of surface area.

If you own a regular fish tank without any plants you only need enough light to be able to see your fish clearly and conveniently. To get that result you'll need about 0.75 watt per gallon.

Sand sifters and watchman gobies are the most beneficial fish for your aquarium. They help maintain your tank clean because they both feed of the "dirt" accumulated on the edges of the tank therefore cleaning you tank while by eating their favorite food.

A good guideline to follow is for every one gallon of water you can keep one inch of fish. Take into consideration that after rocks, plants and decor the amount of space is less. Lastly, you should keep in mind how large the fish will grow. It is very important that you do not overcrowd your tank.