I just did a water test and my ammonia is on 0.5, everything else is zero though. I just changed my filter pads but not all at the same time as i h ave two fluval plus 2 filters so i wouldnt think it was a lack of bacteria. I have a 100 litre (about 25 gallons) tank and i stock 5 bumblee gobies, 5 dwarf puffers, 5 red eye puffers (irrubescos), 2 otos, 1 siamese algae eater, and 2 khuli loaches. So do you guys think that the ammonia is due to my overstocking and if who should i be getting rid of? I do a 50% water change everyweek btw. all help wil be appreciated, thank you

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/www.aqadvisor.com/AqAdvisor.php and it showed something like 288% stocking and 37% filtration. You have several very aggressive fish (puffers) that could sooner or later turn out real bad. How long have you had the tank stocked like this?