posting a link in someone else thread for a response is SPAM and not a good way to get a positive response.
first off you washed the entire tank which killed any benificial bacteria. then you wait 3 days to stock it HEAVILY with all kinds of fish, esp the 2 plecos. your tank was cycling. you removed the filter for another filter, now its cycling again. patience is key. let the filter establish bacteria.
go to www.google.com
type in fishless cycle. read. go back to www.google.com
type in nitrogen cycle. read.
now can a MOD please clean up this thread. thank you.