Flowerhorn suddenly skittish

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Oompaloompa

Gambusia
MFK Member
Oct 24, 2019
25
7
18
24
Have you tested your water?
Yes
If yes, what is your ammonia?
0
If yes, what is your nitrite?
0
If yes, what is your nitrate?
40
If I did not test my water...
  1. ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.
Do you do water changes?
Yes
What percentage of water do you change?
61-70%
How frequently do you change your water?
Every week
If I do not change my water...
  1. ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.
My flowerhorn, Watermelon, has suddenly become skittish these past few days.

He's in a 60 gallon tank in a high traffic area (doorway out of the house) and he has been in this tank for the past 6 months with no issue. He has plastic plants in the tank with him to interact with and to hopefully offer a sense of security. He gets weekly 60% water changes.

The only recent changes are in his diet. I've started supplementing his old diet with a new type of pellet and frozen krill. Initially we thought that he was afraid of us wearing masks but we've been wearing masks since April and he's only started being skittish in the past 3-4 days. Another factor could be light as I've reduced the lighting hours on the tanks near to his which is his light source since I don't have a light for his tank, but I've switched them back to what they were before and no improvement.

Anyone has any idea what's going on?
 
Well, if you had the lighting reduced and now brought it back up, it's possible he got used to the reduced lighting and is now getting used to the increase. I have found lighting is often one of the most important factors in making fish skittish or comfortable, many fish do not like super bright lighting or tanks with no shade/cover in upper reaches of the tank to hide under. I would give him a little time to get used to the increase of lighting.
40ppm is also a bit high on nitrate, but I kind of doubt that's the issue here
 
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He started getting skittish during the time when the lighting was reduced. He had been fine with the reduced lighting for about a month before that. After about 2 days of him being skittish I turned the lighting back up but no change in his behaviour unfortunately
 
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