Goldfish glass surfing

[Inkweaver313]

I had three goldfish I believed to be all females in a 125 gallon tank. They got along great, everyone was happy for about two years. Then it turned out one of them was male and well... eggs everywhere.

We couldn’t have that keep happening so we got a 75 gallon tank, set it up, cycled it, and a month and a half later this bachelor has his own pad.

the problem is he will not relax. He keeps glass surfing. He’ll eat. His fins aren’t clamped. He plays with the gravel, and then he goes right back to swimming up and down the glass. This tank does seem super reflective compared to his old tank. Could it be his reflection? Could he be missing his friends? Any advice?

tank parameters:18"L x 48"W x 21"H

Water parameters:
Ammonia 0 ppm

Nitrite 0 ppm

Nitrate 20 ppm

pH 7.5

 

[Retired Viking]

I had koi and that would be my guess, he is looking for others of his kind. Try lowering the tank lights and see if that reduces the reflection and his behavior.

 

[Salty&Onion]

Nitrates are a bit high, they should be kept below 20ppm so do a 75% water change and see if it helps, but I believe he is looking for others of his kind, just like @Retired Viking said, try lowering the light and see if it helps.