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Hi, I have this tank with built in overhead sump filter... http://www.ebay.com.au/itm/111600251839?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT And I did have an under gravel filter with scoria gravel over it, but have just taken it out of the tank (have I wrecked my cycling???). It held so much gunk, even cleaning the filter wool and vac the gravel every three-four days I could not get all the gravel vacuumed and clean. Ewwwww! So now only have a handful of the gravel left in the tank till I can get some sand in two weeks. My tank was on a slight lean, and the overhead sump filter would backflow ever so slightly. We corrected that today by spinning the tank around so that it faced the other way. The overhead sump has very limited room for any bio media. Once I have two grades of wool in there it is nearly all filled up. At the moment I have these layers (in order of the water flow), * filter wool 7mm thick? (washed weekly in old tank water & replaced fortnightly) * fine filer wool, about 2mm thick (washed weekly in old tank water & replaced monthly) * scoria gravel in a stocking/pantyhose, about 7mm thick (didn't have access to any media bags at the time) (never washed) * and some activated carbon just before it exits the filter (replaced every 4 weeks). I am trying to cycle the tank, and at the moment the tank has been cycling for over 3 weeks, and although I have been keeping the ammonia at .25ppm or lower, the tank has yet to show any nitrites. This is with the overhead sump, combined with the gravel filter. Tank conditions are volume 100L ph8.0 ammonia less than 0.25ppm nitrite 0ppm nitrate 0ppm temperature 20-24 degrees Celsius bio load 2 goldfish (started off with 6 and reduced to 2 approx. a week ago) 2inch each, and 6 12mm mystery snails water changes 30% every 3-4 days to keep ammonia lower than 0.25ppm (todays water change ended up being more like 70% due to the filth in the gravel) chemicals used: prime conditioner only, nothing else. filter: overhead sump 1500lph as above I have removed the under gravel filter and scoria gravel on the tank bottom today (it was a little too sharp for the fish to forage I think), and am concerned * that my tank is not cycling (am I just not patient enough?) * that I don't have adequate volume or quality of bio media. So back to my questions..... Is my overhead sump enough? Should I be looking to supplement the filtration (treating the overhead sump as mechanical filtration, and getting another filter for bio filtration) (it would have to be internal to avoid modifying the hood... more fishy space gone )? Or ditch the overhead sump for something much quieter (YAY)! Which filter type is the quietest? and which flow rate should I be after (considering my overstocking)? I did not want to modify the hood of the tank too much, it is not removable, and am on a limited budget, so a $600 canister is out of the question I really want to keep two goldfish, and they will be replaced with two fantails when the tank is cycled, so I know I need to be on top of water changes/filtration. Would a filter like this be super super super quiet? http://www.ebay.com.au/itm/304B-2000L-H-CANISTER-FILTER-WITH-BONUS-FULL-FILTER-MEDIA-SET-NEW-/400873211528?pt=LH_DefaultDomain_15&hash=item5d55e7c688 Any suggestions? I have a feeling I might be asking the impossible ????