No. It is hard for it to breathe in a glass aquarium. A cage about that size that is well-ventilated would be okay, if you give the guinea pig time every day to run around and exercise outside of the cage.
Guinea pig enthusiasts say that the minimum cage size for a healthy guinea pig is 7.5 sq. ft. However, if you give them exercise, a smaller cage will do.
NO! They can become blind and there is no air circulation. A 7.5 foot C&C cage is the best.
take 15 galon
No problem.
I galon is equal to about 8 pounds. So you would need a 12,518 gallon tank.
my 1981 650 maxim has a 2.9 galon cap.
Salt water probably the colorful rocks and stuff like that
Depends on what you're housing in the tank. Freshwater aquarium to within 1 inch of the top of the tank. Turtles, about 1/2 to 3/4 full with surface outside the tank for the turtles to be out of the water and get warm (so needs a warming light, too.)
A 150 watt bulb should do the trick. A bearded dragon needs about 95F to 105F in the basking spot and 75F to 85F in the cool end of the tank.
It should make the fish in the same tank age faster, and maybe keep them healthy.
5 gallons of space is the same as 0.6684 cubic foot of space. (rounded) We have no way of knowing what's in that space, or how much.
18 US gallons equates to 2.4 (2.40625) cubic feet.
Assuming that the fish tank is no longer filled with water, and assuming that the lid has been removed or ventilation is otherwise assured, there is no reason why a guinea pig shouldn't be able to live in a disused fish tank. Of course, the fish tank must have a suitable size for a Guinea Pig. Most domestic fish tanks will be too small. Given size and ventilation constrains, the bottom line is that a fish tank most certainly is not a suitable replacement for a regular Guinea Pig cage. You should also note that the floor of a fish tank is usually made of a smooth material. For the fish tank, it is important that the material is water proof, and it is beneficial that it is smooth for easy cleaning. However, a Guinea Pig needs to wear out its toenails. You can take it to the vet regularly to have its toenails clipped, and you can learn to do it yourself. This will be essential for the Guinea Pig's health. Alternatively, you might be able to coat the smooth floor with lots of rough stones and coarse sand paper for the Guinea Pig to climb over. These help with the natural manicure.
Well a good start is making sure his/her tank is clean and doesn't have lots of leftovers at the bottom of the tank (this will prevent it from getting sick), Feed it a healthy and rather popular food (if the betta doesn't like the food he will spit it out or not eat), keep the Betta in a tank by himself (this will lower stress) and a very important thing to do is make sure there is enough in his tank to keep him busy/happy.