If you don't wash it properly, yes it can.
Yes any amounts of sugar added to a fish bull can cause great harm or even death to pet fish used to fresh water and their natural fishbowl habitat
It'll harm the all the organisms living in the ocean. That means no sea food or fresh water.
Fish tank if it is properly taken care of. It also does not stink. Water may spill from time to time, but small amounts of fresh water is usually no harm. It all comes down to what you deal with better. Do you enjoy water and observation, or do you enjoy dry and interaction.
it actually helps some plants and kills others. Like it can harm carnations but helps roses. Roses also like coffe grounds very much.
YES!!!!! The oils on your skin will get into the water, and the fish will "breath" it in and it's kind of toxic!
No, but it's not good for them if you pour it directly on them. You can mix it in a container with a bit of water that you are adding back to the tank, or simply add it on the opposite side of where you fish is in the tank without causing harm.
Our body requires water for many reasons, for digestion, the cleaning of teeth indirectly caused by saliva ,and an abundance of other reasons. Fresh water does not contain parasites or bacteria that would harm us.
White suds are usually the sign of a chemical reaction or pollution in the water. So, yes it is possible that it is harmful to the fish.
You may have to smash the ornament somehow., but be carefull not to harm the fish. Ornaments do not belong in a fish type environment. Try water plants.
An armadillo shell, much like the shell of any other animal that has a shell, makes it harder for predators to harm the animal.
Vinegar is acidic. If too much vinegar is added to water, the pH of the water will decrease and the fish will die.
A snail could not eat a goldfish; chances are that the goldfish is stuck somewhere on the tank under decorations (if you have any) and may be dead, or it jumped from an opening on the tank which doesn't happen often, but is always possible.