So I've cut up a Tupperware to make a diy feeding ring, and I was wondering if it was safe to strap some scrap Foamular pink styrofoam to it to make it float? I ran a heat gun over the pieces to melt them slightly to prevent them from flaking off into itty bitty pieces willy-nilly. This whole contraption will only be sitting in my tank a few minutes a day. So, do you think it's safe? I wanted y'all's esteemed opinions before I go tossing anything iffy in my tank!