I am not sure if dunkins are considered soft or hard because they have soft tentacles but I have so guy who said I could have a head for free because the pump to the nano he gave me didn't work. The thing is this guy hasn't really fragged anything before so he wants me to frag it. I was going to use my angle grinder with a vice but he said he doesn't have a vice and it CANT be loud because he lives in apartments. Sooooooo, what should I do? Can I use a manual hand saw or something? Answers are GREATLY appreciated. Also he is giving me a rio 800 for $5 that he says IS functional, is that pump compatible for a aqueon evolve 8 return?? Thanx!