Hey up until you put them in that tank, they were doing great, so dont think you cant keep them, because you can and very well to I might add.
Give yourself some time to get over this and then think again about what you want to keep. In the meantime, maybe move the clarius and other out to the 4ft, then strip it down completely, bleach wash it out, clean out the filters etc and cycle it from scratch, might be worth a try.