My son had an old 5 gallon tank he wants to put a couple fish in. I cleaned it out (no soap), and am ready to put some water in it. I have a cycled 55 gallon tank. I was wondering if it is ok to take some water and rocks from my 55 to “seed” the new tank. I don’t feel like disassembling my FX4 to get some filter media. I don’t plan to stock it any time soon.