I am making a waterfall for an upcoming FBT tank. I have it completely made (and using safe materials - styrofoam, aquarium safe glue and aquarium safe paint) except for a final, clear sealant to go over the finished product. I have seen multiple posts saying to use one type of sealant and then other posts saying not to use that kind. So far, I know it needs to be waterproof and have no mildew inhibitors in it. Has anyone else made homemade ornaments/decorations? Does anyone know what type of sealant is out there that is safe to completely cover a homemade ornament? Thanks!