372xp
Fish Crazy
How can you go from this: 
To this :
Now this guy is a wee bit sensitive, he curls the end of one of his fins when he gets annoyed, and this can be to do with anything inside and outside his tank. This time My guess is I changed his filter at the weekend, same media different filter. I did this during the water change, he was already a bit listless then and I think this tipped him over the edge. So I did another change yeterday and swapped the filter back again. And today after another water change he is like this. I havnt fed him since sunday. He normally gets exited as I prepare the feed for my marine tanks, which I do in front of his tank, as he often gets a brine shrimp or something. He aint doing it no more and its killing me (hopefully not him);
My guess tank crash. Its happened before and I lost another male like it but it was much more sudden.
Reassurance please.

To this :

Now this guy is a wee bit sensitive, he curls the end of one of his fins when he gets annoyed, and this can be to do with anything inside and outside his tank. This time My guess is I changed his filter at the weekend, same media different filter. I did this during the water change, he was already a bit listless then and I think this tipped him over the edge. So I did another change yeterday and swapped the filter back again. And today after another water change he is like this. I havnt fed him since sunday. He normally gets exited as I prepare the feed for my marine tanks, which I do in front of his tank, as he often gets a brine shrimp or something. He aint doing it no more and its killing me (hopefully not him);
My guess tank crash. Its happened before and I lost another male like it but it was much more sudden.
Reassurance please.