morning from the 75 g. I did a water check and the ammonia went from 0 on the last check to 5.0. I did a 50% water change last night. I just changed the bio filter pad and added some more prime.
5.0 is a ton. When did you last check? How long between water changes? How long has tank been running, and did you complete the nitrogen cycle?
When you say you removed bio filter pad- the bio media in a filter should never be removed. Usually it's ceramic tubes or little brown balls. You have bio media? This isn't what you removed, is it?
I lost 2 African cichlids this morning from the 75 g. I did a water check and the ammonia went from 0 on the last check to 5.0. I did a 50% water change last night. I just changed the bio filter pad and added some more prime.