I know I can't watch the fish 24 hours a day lol. I'm just saying I've never seen it use the bathroom lol. Sorry I thought it may have been important.
Gills..... I don't see red..inside the gills when it breaths or outside....so no...no red color...and no mucus or any other abnormalities. It looks like the rest..only it won't move or eat....
Filter...I am using an AQUA TECH POWER FILTER..contains a filter cartridge, intake tube, impeller,filter cover, bio fiber,impeller housing and a strainer..... I am planning to get a 60+ power filter of the same kind. Its the only kind they sell at Wal Mart and that is the only place where I live that I can buy fish supplies/assories.... I have to change my filter cartridge every 2/4 weeks (it contains carbon)..... I have NEVER replaced the bio fiber. Just cleaned it off with tank water.
Hope this helps