You are cluttering up your own thread with your constant posting. Please try using the "Edit" feature (it is below each new post, to the left of "reply," but it only appears for several minutes after you submit a post, then the option expires). This would make your posts a lot easier to read and respond to.
But anyway, first of all, don't base your aquarium off of things you see on youtube (there are
plenty of youtube users out there who have no idea what they are doing).
well ive seen in a couple videos the plamas bichir and the 2 others you mentioned and they were fine in a frikin 85 gallon or sumthing and had 3 4-5 inch oscars. yeah i think it will work but il have to get them botha farely young oscar idk 5" to be safe idk a whats a good sized bichir to start off with the size oscar i mentioned?
Actually, the bichir will need to be as large as possible to begin with to avoid being eaten (you don't want to buy one that it smaller than the oscar, or it may be seen as food).
http://www.youtube.com/watch?v=MSW4g7Gh7fE watch its a tank with a bunch of bichirs and a bala shark plus a oscar few othr fish soon to be in tank as said in description! how does he fit them so well! its a 75 gallon 2!
That tank is far too small for the fish it is stocked with, at adult size (those are all very young fish, and they will eventually need a tank over 100 gallons).
these bichirs you mention eat feeders occasionally?
Store-bought feeders should never be used for any fish. If you want to use feeders, it is best to breed them yourself (in a separate tank, of course).
oscars dont need 65 id say 50 limmit i see oscars in 75 gallon with lots more cichlids and the oscars are big ass id say i could fit 3 oscars comfortably in 75 with good care filteration but i dont cause its harder to take care of. so ima prob get a palmas bichir or delhezi with 1 tiger oscar 3-4 inch long and juvinile bichirs 2 or 3. god you say you need such big tanks but reality i see people on youtube with 100 gallons that are way to overstocked! but im not one of those peopel so il get 1 tiger oscar and 1-3 bichirs down in there and yes chances are it will work id say 88% it will due to many people doing it and with succes!
Oscars will normally grow to anwhere from 13 to 16 inches long, so on the larger end of the spectrum, an adult specimen could hardly live comfortably if it was completely by itself in your 75 gallon, let alone 3 adult oscars in a 75.
I would not do a bichr. My 14 inch Oscar would eat a bichir in a heartbeat. Oscars eat worms so why would they not go for a bichr. Even thou Bichirs get a foot the oscar will eat it. My Oscar does Okay with some giant danios and a rainbow fish that schools with the danios. just do not get slow moving fish. one time I put my three spot gourami in with my oscar and the oscar almost ate the gourami. luckily i was watching them when it happened so i could put the net in between the fish.
If the bichir is of an appropriate size (i.e. not worm-sized), there shouldn't be an issue, unless it is just a particularly aggressive oscar (which most oscars aren't, ime).
a compatible pair could live in a 75 if you are up to maintaining your tank correctly; also you will need a solution fast if compatibility fails.
A 75 gallon is not large enough for two adult oscars, under any circumstances.