Handsome guy, does look like he lost some scales on his head. He could be darting from an ich infestation that may be approaching, but I'm wondering also if it could be parasitic- which causes the darting, etc.
Right now I would just make sure to do regular water changes to keep the area clean.. until you see the ich or another sign such as white waste, there really is nothing better you can do for him.
The debris could be from the rocks- how did you clean them before using them?
A few other tidbits I saw- freeze dried food is rather more of a treat then a good diet, as it lacks some of the proper nutrients you would get in pellets, or even betta specific flakes. It has a lot of protein, but the rest of what is needed isn't up to par. I would recommend feeding 4-6 pellets total a day, spread between 2 meals (2+ meals is idea to feed them, feeding one meal will either be over feeding, or under feeding). Frozen would be very good for them too.. when you do freeze dried (once or twice a week), make sure you soak them in a bit of tank water prior to feeding them as they expand while in the stomachs and can cause bloating, among other issues.
Also, you don't want to be adding in aquarium salt on a regular basis- as over exposure will cause internal problems such as liver and kidney failure. It should only be used for treatments, in the correct dosage for bettas (not what is on the package), as well as for a limited time with daily 100% water changes. Until you see a specific sign of ich, then remove them from the salt water.. would do a 100% water change if you didn't cycle your tank, if you did, then do 50%s over the next few days to clear it out.
You really need to use water conditioner, even if you let it sit out before using it (which isn't needed). Tap water with the correct dosage of water conditioner that eliminates chlorine, nitrate/ites and if possible, binds heavy metals.
In a 10 gallon, once a week 30-50% water change on a regular basis is what you will be wanting to do. Test the water prior to doing the water change to see whether or not you need to up it, or can lower the % each week.
You say they are being treated for ich, is that what the salt is for? If so, how did you do it? And unless you see the white grains on the body, can't confirm it is ich, as a few other illnesses has them darting and scratching.
Sorry, a bit ill, wasn't intending to do this section tonight.. but wanted to help.. so didn't fully read >.< my bad.
I would recommend to stop using the AQ salt if you are using the medications, as sometimes AQ salt doesn't work well with medication. Wish there was more to say to help, but until there are other signs outside of darting, can't confirm to anything :(
Last edited by Myates; 11-20-2011 at 06:50 PM.