My new fantail goldfish seems really stressed out. I re-cycled my 20g tank with TSS and added my goldfish yesterday. He seemed very timid and stressed out as soon as I got him. I remember fantail tank at my LFS had one messed-up fish that was smaller than the rest and hid in the back. I think I might of received this one. As soon as he got in the tank, he immediately went to the back corner and laid on the gravel. He did this for a while but started swimming around. Everytime I check up on him, he hides in the back. He bolts and ends up hitting the glass sometimes into the corner. I thought he would get over it but he isn't yet. He isn't eating and I'm just worried. I would check the water parameters but I am currently out of the test and the tank is being cycled by Tetra Safestart right now. He also seems to be developing fin rot... I'm not sure what to do. Is it just the goldfish or did I do something wrong?