preferably nowhere near anywhere that can generate a vibration eg near doors and also an area which has no direct sunlight which will shine onto the tank. also where there is no temperature fluctuation where the tank could be easily affected eg heaters. Pretty much where a tank can always stay its right temperature with no elements that could change the tank in anyway shape or form.
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.
you can put in sea snails and more brightly fish that you cant get with a heater in your tank
small ones
yes yes
Yes u can, they would actually thrive!
You can not put tropical fish in coldwayter bevause they need hot water to survive but you can put goldfish in coldwater becaue they are coldwater fish
No, you do not have to put real plants in a tropical tank, you can use fake plants if you like. Many people put live plants for aesthetics as the greenery tends to look very nice with small colourful fish
You would not put tropical fish in a tank of cold water because the live in warm climates and need a temperature of 24 - 26/28 degrees Celsius to survive.
It depends on how big your fish are and what type of fish they are, its worth asking the person you buy the fish from. On average you can fit about 20 tropical fish in a 2ft tank.
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 sea horses should only be kept in a species tank (only sea horses)
a fish tank size would depend on the size or how many fish you want to put in or if its tropical the tank would have to be measured and remember to get the water tested you don't want to kill the fishs