My mandarin has been in my system for about 10 months. She has always been on the skinny side but recently started accepting frozen foods. I've been feeding her mysis daily and she's been eating it very enthusiastically.
Recently, I've noticed a discoloration on her fins. White patches on two of her fins.
Ammo 0, nitrite 0, nitrates 5, phosphates .03, sg
1.024, temp 72-74.
I've got a slight nitrate issue as I've begun feeding new seahorses 1-2 times daily. I'm doing weekly water changes and am going to add more macro to the tank to try to boost nutrient exporting.
The only thing that has changed is the temperature. I've converted the tank to a seahorse tank and it is recommended to drop temps below 74. I took very special care to drop from 78 down to about 73 very slowly over the course of about a week. These white patches seem to have appeared right around that time, but it may be a coincidence.
Not sure if I should just monitor this or remove the fish to a QT tank. Could this temperature really be a problem for her? Her behavior has not changed at all and she has definitely gotten noticeably bigger since eating frozen. I also don't want to spread anything to my seahorses.