Excuse this post but.........
You don't seem to have done any checking before you bought fish or plants. I know you said you have been keeping fish for over 10 years but if you were keeping a mix like you have now you been doing it inhumanly for over 10 years.
Everyone on this forum is trying to help YOU help your FISH. You simply put have too many big fish for a 55 gal tank. You started this thread like you had this vast amount of knowledge about fish and the bioload and having some Eco complete tank, but the plants you have will not combat the amount of poop from the plecos at all (I don't actually know how the 2 go together anyway but I am a newbie) The way your keeping fish reminds me of a petco or petsmart, sorry....
Please see estimates of your fish sizes below:
3 pletcos (all small) don't know what kind – could be up to 30 inches each = 90inches
1 Large common pletco - up to 30 inches = 30 inches
3 (Chinese algae eaters) up to 11 inches each (more commonly 6-7 inches) = 21 inches
4 Green Tiger Barbs – about 3 inches each = 12 inches
4 medium Tiger Barbs – about 3 inches each = 12 inches
4 medium T-barbs- about 3 inches each = 12 inches
4 Giant Danios most likely – 6 inches each = 24 inches
2 red tail sharks (1 Small 1 Med)- 5 inches each = 10 inches
2 black Convicts and 4 Pink Convicts?. – 5 inches each = 30 inches
3 blue channel cats- 44 inches each = 88 inches
2 Picus cats – 7 inches each (if they are the 4 lined) = 14 inches
2 Jack Demsey – 12 inches each = 24 inches
That is a total of 532 inches of fish for a 55 gal tank which is about 477 inches to much using the 1 inch per gal rule.
All this info was from http://www.elmersaquarium.com/000tropfishcareguides.htm
you should check it out because it would be a good stating place for groups that tend to go together
Also posted in your other thread for the effect