I got some clownfish about three months ago from petco and put them in a separate tank and was planning on quarantining them but im to busy to do it, its been 3 months and they are completely healthy would it be okay to put them in my new tank with my other fish? any other fish ive had that was sick died the first month and these have been fine. After 3 months and them looking healthy could they still have diseases on them?