Hey all, im a big fan of bananas.org so i thought id give this site a try! I have a 220 gallon water-tank outside here in illinois that i just keep small (walmart bought) goldfish in...i only have a dozen or so but they are thriving and i cant wait too see if they have babies or not...i also have those black goldfish with the big buggy eyes but i forget the name of them and a few small algai eaters too! My question is i dropped a 10 gallon tank in the middle/front of it and i have it kinda floating around in the 220 gallon tank...i want to start to keep tropicals in the 10 gallon tank! I have a small horse-trough heater that keeps 220 gallon tank at about 35 degrees f...which of course is good enough for the goldfish to survive in and to keep the water from freezing...but i need to raise the 10 gallon from the same 35 f to 75 f. Can this be done with say like (2)two (walmart bought) 60 gallon fish tank heaters? Iv tried a normal 10 gallon heater and it didnt do anything! So are they only ment to raise the temp like 10 degrees or so like the tank was in a house and the bigger the heater just for more water or MIGHT this actually work???
THANKS-TOO-ALL
ROBBY
P.S. Il post pics in a day or two...but dont expect much...because im not a photographer or a very good fish-tank builder...i just like trying off-the-wall things!

I suspect it will take more then 2, 60 gallon heaters. Water conducts heat much faster then air so you are going to lose a lot more heat suspending your 10 gallon in 35 deg F water then you would in the same temperature air.

You also may want to make sure you have sufficient water movement to keep the water at a similar temperature thru out.

It might help if you insulated 4 sides with a closed cell foam (leaving only the front to view the fish) and covered the aquarium with an insulated cover.
You might be able to do it but i would want to test it before adding fish.

Hey thanks a lot for your input...and ill definatly be surrounding 3sides and top with the insulation of that which you speak...and i think i have plenti of water movement in big tank and ill be starting my water movement in the smaller one soon!
THANKS AGAIN!
ROBBY

Might want to think about insulating the bottom too.