Invic· Export with Care!
Well the Conch isn't really going to eat the poo, mostly left over food. Then you have a Snail that is pooingi have a molly fish that loves to leave large piles of excrement everywear. Would a fighting conch would able to deal with this?
Typically it doesn't make a big impact, on the volume sadly. Overall its not going lower the amount at all. For excess food scavenging that fish miss is really the only big help he would provide.
Best bet is just siphon clean more often and maybe change less water but do it more often. How often are you siphoning now?