My yellow tank is scratched up? I saw him scratching, checked the water and realized the pH was low (>7.4) so I put some baking soda in it and got the pH back up to around 8 but my tang has an orange spot on his tail where he was rubbing against the rocks. I read that as long as the wound does not fester, I need not intervene. Its now been a couple days all water parameters are good but my tang is still scratching pretty aggressively? I have checked him quite closely but I see no indication of ick and none of the other fish are having difficulties. What do I do?
Ok stop dude.
1: throw the ph tester in the trash, you don't need it. And stop buffering the water, sudden changes are stressful for all the animals. This isn't about chasing numbers.
2: the animals behavior is from an opportunistic pathogen. Exactly which one is hard to say. We need some pics to form a diagnosis here. The spots you see are from the organism and not from the scratching.
3: yellow tangs are prone to bacterial infections.
4: not having visible white spots does not rule out ich, but given the other descriptions given, it's likely bacterial.
Answer some questions here.
1: how old is the aquarium.
2: what size is the aquarium..
3: how long has the tang been in your aquarium.
4: is this a fish only tank or a reef?
5: what other living things are present in the tank. (Tankmates)
6: what is the last thing you added to the tank.
7: did you put this tang through a QT process.
8: is the fish eating? If so, what have you been feeding it.
9: where does your source water come from?
10: recent parameters other than the pH.
Answer those as detailed as possible and post a pic of the subject, we will try to fix him.