So on Wednesday I did my first monthly filter maintenance and I think I killed some of my BB. On my 55g I started off by filling a bucket with tank water and then took my canisters middle and top trays with bio media and put them inside the bucket. I then pulled out the bottom tray and cleaned out my coarse and fine pads in the same bucket but replaced my 50 micron pad. I put the bottom tray back in and then dunked the 2 trays with bio media in the bucket and back into the canister. Today I tested the water and ammonia was .25ppm and 0ppm nitrite. On my 10g I filled a bucket and cleaned out the coarse and fine pads and again replaced the 50micron pad. I left the bio media in place on this one. My test results were 0ppm ammonia and .25ppm nitrite. I did not test for nitrates as I kind of went straight to doing the water changes and my tap water reads 5-10ppm nitrate anyways. Did I over clean???