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No, you don't ever change battery water. Batteries have hydrochloric acid in them, not water, even though you use water to top them off. Do not mess with the acid in your battery. You should always use distilled water to fill your batteries.
In a typical water change, you should replace 1/3 of the water but always use tapsafe which you can get from your nearest aquatics store and if its marine remember to add salt too!:D
Because they feel that since they can, they should.
Overfeeding, and not chaning the water enough. That fog is a combination of phosphates and ammonia, which comes from decomposing wasted food and fish waste. You should change about 20% of the water once a week, and make sure to remove any uneaten food from the tank. When you change the water, you should age it for 24 hours to evaporate chloramines, you should also use a water conditioner.If it is fogging up quickly, such as every couple of days, change the gravel or use a gravel vac, there may be waste trapped in the rocks.
They use their antennas as second eyes. They feel around for where they are going and also to sense where their prey is. They use them to feel the vibrations in the water.
they do not change shapes,whenthey relax and contract we feel and see then moving.
You should use water, you need it to survive. Just don't waste it.
Yes mix it with a gallon of water and drink it all, you should feel a rumble start in a couple minutes.
Water pollution can change the quality of water and make it unsuitable for drinking.
To change the way they feel.
If you practice, you will learn how to use pronouns. That should change the way you write.
You should change at least 50% of the water in your tank each week at minimum. If your tank is too small, to over-stocked, or you do not have enough filtration, then you will need to change the water more frequently.