Frogspawn, Hammer coral, and Torch coral all will sting the s*** out of your corals. I try to keep all my corals away from each other. The other day my frag of green montipora fell on to a couple of branches of my acropora and its polyps stung it pretty good. I keep every thing away from my frogspawn to... i have had to even move stuff around cause that stuff grows so fast. The frogspawn and hammer can touch each other cause they are from the same family. Hope this helps.