We bought a 12g tank just to practice cycling and to test water conditions before we get the big tank. We might put one fish and a cleanup crew in the future. I added 7lbs of LR but only noticed the day later that it had a clam and small snail in a crevice. The clam was alive as I could see it open and close. Should I still add a small piece of dead shrimp for the cycling process? I was also thinking of adding a couple more lbs of LR.