Well, of the 3 organisms you have questions about for this thread, the anemone looks to be in good shape, and (with continued care) will probably be the only one to do well. Sorry if this comes off as negative, but these types of sponges almost always fail to survive more than a few weeks in an aquarium. They simply require too much particulate/suspended organic material to survive (usually lacking in almost all captive systems), being constant filter feeders. As it begins its decline it will release toxins as well as organics to the surrounding water of your system, so as has been mentioned, it is probably best to remove it before this happens.
The gorgonian is indeed non-photosynthetic (Diodogorgia nodulifera), and they also have a very poor record of survival in captivity. they come from deeper waters where there is little light, and therefore are overgrown easily with algae in our usually brightly-lit tanks. They need to be fed frequently with "planktonic" food, and in my experience, when they begin to "degenerate" there is little that can be done to reverse it. Yours already appears quite thin, so it may already be too late, and it is probably best to also remove it if possible.
Sorry for the bad news, but non-photosynthetic inverts really need a dedicated system to survive very long (i.e. more than a few weeks) in captivity, and even then they can be difficult. Good luck with the anemone though, it appears quite healthy at this point, and LTA's are one of my favorites - I just do not have a tank big enough at this time to keep one!
Also, I do not believe Condylactis anemones split...
