No crabs cannot live in a tropical tank. If you go to a petstore they will try to sell you small fiddler crabs, however they do not live in freshwater, they live in brackish water like most small crabs. All brackish water crabs need to be able to be out of water for a certain period of time. If you do buy one of these crabs and put them in your tank they will only be able to survive around a month.
Probably the fish. I would not put a crab in a tank with tropical fish unless they were a LOT bigger than it was, and it was not going to grow any larger.
Betta, goldfish.ex.
Yes, it is bad to put tropical fish in with river fish. The river fish can make the tropical fish sick.
it depends how big the hermit crab is or the fish bowl
You can put some but not all cold water fish in tropical tanks for example you can put zebra danios and mountain minnows with tropical if you gradually increase the heat. You cannot do this with goldfish. It depends what fish you have.
yes
You can't put tropical fish with each other or they will eat eachother
you can put in sea snails and more brightly fish that you cant get with a heater in your tank
you put the fish stick on the toy helicopter and use it to get the crab
None, goldfish are cold water fish, so having a tropical fish as a tank-mate just wouldn't work because tropical fish need to live in warm water.
No i wouldn't recommend it
Go to the beach and put the fish sticks onto the helicopter. Wait for the crab, then lower the hook and catch the crab. Then you can get Greg's money back.