I undertandi dont have larger tank at the moment. and by "100+ " i meant a tank that has a capacity over 100 gallons. i want to get a tank that is closer to 200gal though.
Yes, the tank is cycled.While Oscars are notorious for sulking (I know, I had one too) i would test the water just to rule out the possibility that you may have had an ammonia spike or something of that sort. Is the current 10 gallon cycled?
I plan on keeping the 40 gal for only several more months. i plan on getting a bigger tank set up and ready by the end of the year.How long do you plan to keep the 40g running?
It's pretty common for an Oscar to hit 8-10" in its first year.