Help! My silver arrow hasnt been eating for around a month for now and hes around 19 to 20 inches. Ive fed him shrimp, and fish bought from the supermarket and also live goldfishes from the fish store. I've also changed the 3/4 of the water in the tank around like 2 days ago and I added a bit of salt in to the water. Ive checked the water temperature to see if the water is hot enough for him (witch it is). Ive raised him for like around a year and half (basically I started raising him when he was around 3 inches) but this has never happened to me and I know arrows tend to not eat for a while but this is still worrying for me..