1- I have an Oscar who was sitting on the rocks and not moving for about an hour this morning, and didn't seem to eat when I fed him and the others (I have a 36G bowfront that is pretty tall, and normally he's swimming around the middle/top waiting to be fed). He had a battle with ick once or twice that I was able to cure pretty quickly and he doesn't seem to have that this time around (even when he had it, he was still swimming pretty happily it seemed). I think this might be stress, which leads me into point #2, but is there anything else it could be?
2- I have 3 smaller convicts in the tank (I think they are fall females, they have orange spots on their sides and blue in their fins -- can anyone confirm?), and yesterday for the first time they started pecking at my electric blue johanni who is slightly bigger. I thought maybe this turmoil was upsetting my Oscar (and perhaps the others in the tank) -- could this be? My Oscar is by far the biggest in the tank, so frankly I figured he wouldn't care that some of the other smaller fish are grappling, but maybe he does...?
3- I am hoping that maybe the water parameters are just a little out whack and maybe this can be corrected when I do a water change tonight. I know it needs it pretty badly...would that lead to stress and thus, his behavior of laying on the rocks?
4- Obviously Oscars produce a lot of waste, which is leading to me having to change the water more frequently, so...to reduce waste, should I possibly reduce feeding frequency to once a day rather than twice a day? I typically feed them at 7am and 6pm, going around 12 hours between meals which I thought was nice for them. I was reluctant to drop it down to once a day because A) the Oscar honestly looks like he could eat like 8 times a day, and there are also 6 other fish besides him in the tank which I thought was a reasonable amount and therefore just unfair to feed only once a day...
Again, appreciate the feedback.