Do I put the fish on tin foil in the rice cooker?

That may happen if heat is dissipating from the tin foil faster than it can be generated. Insulating the tin foil and/or blocking any wind from cooling it should yield...

Yes, the rice plant will help maintain the chemical stability of the water.

Some would say two, but to be honest, you can put as many fish as you want, as long as your bio-load isn't too much for your filtration. A good...

Yes, most rice cookers have timers on them and it usually takes about an hour to cook the rice. If you steam the fish along with the rice, they will...

Sometimes yes and sometimes no. It's best to look in your steamer's manual for instructions about using aluminum foil.