i have a magfloat that i used for my old 55g tank. now all i have is a 4g pico tank and i was wondering if i could use the magfloat that i used on the 55g to scrape it. i just wasn't sure if the magfloat would be too much for the small tank since they have different ones for different sized tanks. thanks in advance for any help. i don't want to crack the 4g so i wanted to ask here before i tried it.