I got four Heckilii earlier in the week and introduced them to my tank properly etc etc. Within a few hours they were eating and have settled in really well. Last night there was no signs of any of them being sick.
This morning when I turned on the lights I find one upsidedown between a rock and the glass (not stuck, just upsidedown). I removed the rocks and helped him upright only for him to fall over again. He's breathing really heavily and he has lost almost all color.
I've added a small amount of salt and I'm wondering what else I could do, or what could be wrong?
There has been regular water changes on the tank
Thanks