No I haven't, I've been using the Hagen Test kits So even w/ the aro and 2 parrots, would it be overstocked? I got the aro when he was 2-3" and the aro is around 10 months old and I upgraded from a 55 to the 90 last December already. He seems happy with no problems swimming and turning due to space constraints right now. Unfortunately buying another tank in the near future is impossible for me.....My student loan on fish can only run so far