besides what sounds like it could be a cool band, its what I think is wrong with my 30g.
for those who have not been following, all my tanks have cycled fine and are now for the most part healthy, with the exception of my 30g. Ive stripped and rebuilt the tank, swapped out EVERY decoration, plant and even the gravel, and rebuilt the tank. the ONLY common denominator has been my penguin 200 filter that I bought about a year ago (give or take). the tank would seem to cycle fine, then over time the ammonia level would creep back up. Id strip it all down, rebuild it, and id have the same results... ammonia levels about 0.5ppm after a month or two.
this last time I even changed out the substrate, and added a tetra 60 sized (the big double) filter with established bags. after a few weeks the ammonia levels came down, nitrite was undetectable, and nitrates stayed around 30 or so right before water changes (it gets 20% changes every week) and bam! it was running great. So it ran like that for i dunno, 2 months now, I took out the tetra 60 and put it back on my 110g and the 30g params crash all over again.
this morning (its been a couple days since I removed the big filter) the levels were ammonia 0.5ppm nitrite 0.5ppm and nitrates were over 80ppm.
after careful inspection there is absolutely no build up of any type on the penguin biowheel... and its been running for nearly a year! is it possible the biowheel was some how contaminated? maybe I missed something reading the paper work and skipped a critical step in setting it up initially?
for now I put a tetra 30 (i think) filter on it using an established pad from one of the tetra 60s on my 110g and im going to do a 20% w/c right now.
any thoughts? is it possible to screw up a biowheel? oh and to answer the one question i know ill get, no I dont wash or rinse the biowheel :P ive never touched it!