well i just discoverd that my fish tank has high amonia. i have desided to move the fish in to a small cup, and put them in to my 15G. will this be ok? second, i was going to use my garden hose to drain the tank. take out the subtrate, and replace it with 3 dollar play sand, wash it off, and put it in the tank, and replace the heater. than, with the hose, attached to the house this time, fill it back up, with a blue plate on the bottom. prime the filter and get it going( it has been rinsed, and cleaned, and drained of all water). if there is any probs with what im going to do, PLZ tell me.