food flaots
It might be unsafe to drink because fish food, fish scales, fish waste, and many different kinds of bacteria are in fish tank water.
Tropical fish stay at the bottom of the tank when the water is changed.Its because fishes feel a change in water, like the temperature and pH value, due to which they get stressed, so they decide to remain in corner or at the bottom of the tank, until they feel they are comfortable.
I gently syphon the water out from the bottom of the tank into a bucket, thereby removing the mulm and poo that have accumulated on the bottom of the tank. Then I use the dirty water to water pot plants etc. I top up the tank by syphoning water that I have heated and prepared with chlorine neutraliser back into the tank from the bucket.
Measure the tank. You can get fancy and subtract the thickness of the walls (and the gravel on the bottom).
if u have a fish net gently swirl it around near the bottom of the tank. if he doesn't run away.he might be dead or sick. if there r other fish inthe tank with him moov him to another place even a bowl of water.
they just settle at the bottom of fish tank
they eat left over fish food on the bottom of the tank (if in tank)
Some people do not believe it but the best water to use in your betta fish tank is tap water. Bottled and distilled water has been "purified" and does not have the minerals that your Betta fish needs. If your tap water is so bad that you do not even drink it, than use spring water.
Take them out and add what you forgot most of the time is water solution
gravel
yes so they can grip the bottom of the tank and they dont slip around
Different types of fish swim in different layers of the water. Top floaters, bottom dwellers and middle swimmers.