Its always easier to exclude something rather than try to remove something later. I'll hold of for now on the gambusia, but I may rethink this if the SMB (which I plant to add in the fall of 2014) ever over-populate or the forage do not hold up. I am hoping to get RES and YP soon, but the hatchery that I was planning to get them from is very slow on returning emails. It still may be too early.