Help With Betta Diagnosis!

[kells728]

Well, here's the scoop. I have a male betta fish (named Plato) in a 1.5 gallon tank, who has been very healthy until today. I did an 80% water change and put in flat marbles which were new. I rinsed them well in warm water and then cool, NO SOAP, and they said that they were safe for aquarium use. Afterwards, I put Plato in and since then he's been laying on the bottom and looks kind of grayish. He goes up to breathe and then just lays back down. Anyway, I have no idea what's wrong or how to treat him. Could it be the marbles? How should I treat this? Please help!!!


Update:

Last night after I posted I put him in a big bowl. He seems to be swimming a bit more, but still not up to par. Just wanted to let everyone know. Also, it looks like the sides of his head and eyes are grey. When I come over to the bowl he swims around, otherwise still just laying. Thanks!

 

[darkwater]

Could be the marbles. In that case transfer the fish to another tank with old clean water. Put a small pice of dried banana, manggo leaf. or a tablespoon of non iodized table salt.

Or try flaring him with another betta

 

[kells728]

Could be the marbles. In that case transfer the fish to another tank with old clean water. Put a small pice of dried banana, manggo leaf. or a tablespoon of non iodized table salt.

Or try flaring him with another betta

I don't have another betta, I could try a mirror. I've put him in a bowl, per my update above. So, should I go with the salt or what? How do I know it's the marbles? I don't know what else it could be though...

 

[WILDER]

Where is the grey as grey slime sort of appearance can be poor water quality, bacterial infection to parasites, is the fish flicking and rubbing.