The Puffer Forum

what does it mean if a gsp loses his colors ?
like his green becomes white or light green~yellow

First thing that comes to mind is that he was or is sleeping. I see this fading and lightening of colors all the time, especially in my Ceylon puffer, who seems to change colors more than a chameleon - and it's mainly when he's been sleeping down at the bottom of the tank in his favorite resting spot. The time to worry is when your GSP turns dark olive with black sides and belly.

he has blacksides in the morning but no black belly
his blacksides goes alway at dark

Black anywhere on a GSP is usually not good. Up at the top of the page, there is a pink area where it tells you what information to give us, so get that all together and post it here.

Some puffers go nocturnal too.. they are used to being out and about at nighttime and will go into "hiding colors" during the day. Generally they will switch over to a normal schedule given enough time. I've had GSP's in the past that hid all day but during the night you could hear them crunching snails and sucking them out of their shells.. quite disturbing when you are trying to sleep!

If the puffer's weight is good, generally I don't worry too much about odd colors, each one is unique and some tend to stay darker, some lighter.. but if its skinny or having skin lesions or anything like that, then further investigation is required.

But of course, when in doubt, clean water can only help!