Male Bristlenose Pleco Appearing Extremely Bloated in Belly?

I purchased a few albino bristlenose plecos from my lfs about a week back.
I lost 1 of my males who was 1/2 the size of this one in the photo--when I found him he appeared bloated in the belly with dark spots on it.

Now, I have come to find another one with this strange bloated looking belly.
This is also a Male Albino who appears to be doing well in all other aspects (swimming, eating, gnawing on driftwood)...I'd hate to lose another one.

Water has already been tested by both myself and my lfs and neither of us can find any issues or cause?

Api ph 6.0 (possibly a bit lower)
0 ammonia
0 nitrite
20ppm nitrate
gh 6.7
kh 2.23

Partials done every Thursday at about 20-25% (this is a 90g tank)
Filters cleaned and maint. every month (end of month)
Prime used every time water is added
Plant additives per directions:Flourish, Flourish Excel, Flourish Phosphorus
Also added per directions: Big AL's Bio-Clean

 

Welp another one died...I went from 4 on the 7th to 1 as of today.
The only thing I noticed on the 2 of the one that died was the odd stomach bloating. The 1 that died this morning didn't have the peculiar bloating.

The one remaining is the one in the photo. I called the lfs and asked if they were having issues with the remaining ones and they said no, I asked if they were wild caught thinking parasites and they told me they were bred locally.
After double checking my water they had no idea and the best they could do is to do the stores norm (1/2 credit of the initial cost...which is honored up to 14 days). The senior up there told me not to bother medicating the entire tank since everyone else is perfect and to just "keep and eye" on the remaining pleco.

I feel horrible since I can't think of anything to do for him (knowing his fate is probably going to be like the other albinos).

Suggestions? Anyone???

*Makes mental not to stay away from the albino plecos*

 

I did the peas already, and I took a quick vid using the camera (quicktime format) and they were acting fine in all other aspects...actually in the vid I think you can see him pooping if I remember right. ((Couldn't get it to load into youtube, but then again don't know much about youtube either)).

Today he's hiding behind the emperor 400 lift tube so I can't check on him (booger)...but as of last night he was soo completely swelled that even his anus was blown outward in a bubble like shape protruding away from his body.

I've done a lil research on my own and came across a few findings where others had the same issue with the albinos (not saying the condition is normal or just prone to their coloration)...all that I read about died despite peas, starvation, and medicating. The one that made it (the article said) ...was treated with nothing & just left alone.

From what others thought-->I'm pretty close with my guessing also. *Constipation (not sure on this one..would think with the peas and green beans that it woulda fixed it even if it was)
*Over eating (another possibility here--eatings are good in my tank)
*Not digesting food (possibility here)
*Parasites (thinking not since lfs said others were doing fine and they were bred locally)
*Swollen Air (hmm...all the bellys are soft....and so is my last ones?)
*excess fiber and lack of vegetable in diet (fed Hikari algae wafers & french cut green beans...so this can't be it)
*Pregnancy (but these are not females...at least the last one isn't in my case),

 

Okay, he just came out when I shook the intake tube. He's massive, his anus is completely blown out and the swelling now looks transparent like he's going to explode from their-or the belly.

I'm thinking air now due to this, however to be on the safe side I have added a few peas and french cut green beans just in case it is constipation.

 

I only have 1 left, no spare tank..heater..etc.
Wondering if tossing him in a container over night with the epsom salt would work.

He keeps hanging on the back of the intake tube and bobbing at the waters surface with the tip of his nose? That's what's leading me to think its air.

If it is, do you know of anything that will work for that (will the epsom salt?)?

 

umm...I don't think I could do that (is a wuss when it comes to handling the bristlenoses). I did the epsom and put him in a container..he still looks swollen to heck and back. How long should I leave him in there?

 

I'm clueless, thinking it's air...he doesn't want to eat.
He's swelled to the point that his stomach is looking transparent and he's still bobbing at the surface with just the tip of his head.

I'll try another day in the salt, but I doubt he will make it through the day at this point.

I feel terrible for him and I'm grasping at straws as you can probably tell at this point.

I've done some online browsing and have seen other photos that look exactly like what I am seeing with mine (like someone took an airpump to his belly and blew him up--just on the bottom though).

 

I have eco-complete (Dirt)...and I'm pretty sure he's not eating it (has been staying near the top levels of the tank since I got him.

 

Nice Avatar Ryan! I like it.

 

its very nice looking...I like the ?white stripes/coloration running longways.