I just got back from the beach with my kids and we found a few clams (about an inch large), some mangrove seeds that are germinating, some white macroalgae, and some coral rubble that I'd like to trhow in the tank. I know QT is the way to go, but I don't have a QT setup. What risks exist if I were to toss the stuff in? I will put it back in the waves if I can't keep them...