Well that is a good debate. Pesonally I don't like pleco's, so of course I think it should be removed. As far as whether you need a divider or not for your jags, is really up to your observations. However, be aware that this love fest can change at any moment. Most hobbyists like to provide at least some type of cover so that if they do get in a tiff, the abused has a place to get away, before getting trashed. Eggcrate is one way to go, but a flower pot or cave can provide a safe haven too.