I had two pepermint shrimp after my tank cycled to get rid of apastia but during the last month i've seen more come back... (the cycle was about 10months ago) so... i was wondering if one would be alright in my tank. (I traded in the two I orginally had awhile ago). I don't use kalswiker (sp.) and there are alot which are behind my rockwork which I would like to leave alone since I probably wouldn't get my rocks back the way they are now, any advice.