So I got home this evening, turned on my tank light and noticed that one of my Black Phantom Tetra's was swimming quite high in the tank himself away from the rest. Then I couldn't help but noticed his colours were showing more, like a different shade, with almost like a blue tinge, but with a strange lighter area on him, like a patch. He goes back down to swim with the others, but then occasionally he will rise to the upper area of the tank again. He's swimming ok and not acting sickly.
He looks more bulkier as well. At first I thought it may be a pregnant female but I believe he is a male. One point he even chased a Rummynose Tetra away, this is behaviour I've never seen.
I've only had them 1 week (only completed my fishless cycle a week ago).
In my tank I have
9 x Black Phantoms
6 x Rummynose Tetras
1 x Hoplo Catsish
1 x BN plec
Here are pics below. First one is the Tetra in question and the other is another one to highlight the difference. The last one is him swimming in the upper area of tank..
He looks more bulkier as well. At first I thought it may be a pregnant female but I believe he is a male. One point he even chased a Rummynose Tetra away, this is behaviour I've never seen.
I've only had them 1 week (only completed my fishless cycle a week ago).
In my tank I have
9 x Black Phantoms
6 x Rummynose Tetras
1 x Hoplo Catsish
1 x BN plec
Here are pics below. First one is the Tetra in question and the other is another one to highlight the difference. The last one is him swimming in the upper area of tank..