
Christina,
HI AND WELCOME TO FISHLORE!
You get the dancing pickle, because my daughter's name is Christina.
Pleco's are scaleless fish, they are more susceptible to bad water conditions much like loaches and other catfish....
I would like to point out, without hitting you over the head, that your tank is heavily overcrowded....The fish you have together are not suitable tank mates, and need a MUCH larger tank to stay healthy. It sounds like your pleco has "body Fungus" it is described as grayish-white stringy material covering most of the body, white or grey patches. It is also called columinaris.....it is not a true fungus, but a bacterial infection. You need to quarantine this fish and treat it with maracyn.
I am not an expert, but this is my best guess.
Are you doing water changes? With the crowded conditions you have you should be changing 50% every day.....until you get a bigger tank.
To give you a better idea of how large a tank you need please research each fish you have in the Freshwater fish Profiles section up at the top of this page under "ARTICLES"...that way you will know it isn't just coming from me....
Several of your fish fall into the really BIG fish category that you have to count in the 1 cubic inch of adult size fish per gallon rule. Big fish produce big waste, but we recommend to people to buy the tank the size they WILL GROW TO, instead of buying fish small, and planning to get a bigger tank when they grow big....problem with this is that unless you are ready right off the bat to upgrade to a bigger tank, your fish will be stunted, and never be the healthy fish it could have been.
Good Luck, and hope your pleco recovers.....don't be discouraged, we all go through these same issues....That's why we ALL have MTS.....Multiple Tank Syndrome...
