At least i think i have one. I need help figuring out where to put which fish in what tank?

ok right now i have youngens so they are pretty small. (2 oscars 5-6in) (3 oscars 3-4in)
1 Green Terror sitting at 3.75in. (the channel cat is going into my ornamental pond, once i make one!)
so this is the question
all of these fish are in the 165gal
i want to lower the bio load so i bought a 75gal (actually 80gal I didn't realize that when i bought it!)
none of my fish have paired yet so need to know would 4 O's in the 165 gal? and the green terror and one O in the 75? i know it would be a lil crowded in the 75 but it would also be easier for me to do the regular maintenance on it b/c it's a smaller tank.

so any opiniions?

That is the way I would go if it were me. IMO. As the O's get bigger you may need to separate them but for a while yet the arrangement you are considering would be a good one!

the oscar and the gt in the 75 would work for quite a while. though oscars are fast growing fish the gt is a slow grower so it could be good for a year and a half or so before the gt gets big enough to cause much trouble.

as for the other 4 oscars, the 165 wont be big enough for them by a long shot. i think you might be looking at rehomiing an couple of oscars or getting another tank for them. for the time being you will be alright but only until they get to about the 10 inch size then the problems will probably start for you.