Hello all....new to this and I thought I did enough research to get my tank to cycle no problem but I was mistaken. Tank has been set up for about 12 days now. I threw 5 juvenile cichlids into my new 50 gallon on day 3 and used a friend's filter media from his established tank...PH is always at 8.2. I never saw an ammonia spike (just a very small reading in the beginning). Never had any nitrites and skipped right to nitrates under 40ppm. did a 30% water change to clear it out. everything zeroed out like I was told it would and I thought my tank was cycled. Under advisement from the LFS (I know I know...not the best idea), I added 9 more inch long cichlids (all mbunas by the way)and two plecos...I am now seeing an ammonia spike .50 ppm(, still no nitrite but my nitrate is climbing.(still under 40ppm). I added Prime and some safe start to get ammonia down and bacteria up 2 days ago and it won't drop. isn't climbing but won't go away. any idea why I would have ammonia, no nitrites but nitrates? any and all advice is appreciated.