okay so i have a 75 gallon fish aquarium and i was wondering if icould put one oscar,one green terror, and one firemouth together in the same tank.

I wouldn't put that much in one 75 gallon tank... But it will depend on your Tank maintenance, and What filter you are running.

i havent bought one yet im just trying to plan everythimg out lol what kind of filter would you recomend.

defenently canister filters are the BEST its usialy better to have dual filtration systems incase of a faliure. One of the best brands in my opinion out there is fluval, they have good quality powerful filters. For your tank you could go with like a 405 or two 205 but there are good overhand filters out there i just dont think they compare to canister filters. Thats just my opinion though lol but it seems lately everyone is having a fasination with fluval FX5 canister filter. Good luck with your new tank.

ok ill have to check these filters out and do you possibly know an estimate of what these filters will cost. and one more thing do you think that these fish would get along and not fight very much? I read on a website that green terrors and oscars shouldnt be put in the same tank and i just wanted to know if this was true. and also thanks for the advise it really helped!! and also would the fluval 305 be good for my tank?

You will need two 305s for your tank. Would be a good choice..

You need total filtration rated for 150g

Green terrors should not be put in with oscars. GT's are really aggressive and once it starts growing it will batter and even kill your oscar

With a 75g you only have enough room for 1 large tankmate (12inch) or 2 small tankmates (like firemouth and blua acara). Be warned that you will have to do a lot of water changes if you stock 1 large tankmate or 2 small ones

yeah do you think i could put an oscar and two firemouths in my 75G?

Just to let you know a 305 is rated for a 70 gallons, and i know some fish are more agressive than others and is most cases thats true. But i think that in a good amount of situations it all depends on the individual you could put 100 fish in and your oscar may only like one or two. The people at petsmart didnt recoment puting a bp with a oscar and look it worked barely any agression also Blood parrots are a choice you could look into or silver dollars. Blood parrots are supposed to get up to 8 inches but in most cases ive read them maxing out at six inches.

Welcome to the site... and thanks for posing the question about tank mates BEFORE you purchase them. So many people don't and then we are repeatedly telling them to get rid of some fish because they are overstocked or having water problems.

You may have already read these articles on the site but in case you haven't:

Tank size info:
www.oscarfishlover.com/helpful-articles/oscars-need-big-tanks

Tank mates info:
www.oscarfishlover.com/oscar-fish-tankmates

The issue is that you want an Oscar. They start small but get big! I bought mine in November at 4" and he is now 11" and still not fully grown. He is in 120 gallon tank with a Jack Dempsey and I barely have enough room. A 75 gallon will be just enough to comfortably have your Oscar and 1 or 2 SMALL fish (this is Brooksie agreeing with Delboy!)

Lastly, if you haven't figured this out yet, fish stores do not know what they are talking about. You are doing the right thing by coming here for advice. Remember to fully cycle the tank before you put any fish in it.

Cycling your tank:
www.oscarfishlover.com/how-to-cycle-a-tank

Hope this helps (can't advise on filters - I have a sump and its all I know!)

Brooksie

Glad to see you on again brooskie

Thanx and yeah i have learned from family and freinds about buying any kind of animal before research. lol My friend bought three oscars and put them in a twenty gallon and i showed him this website and some videos on youtube to show him how big oscars can get so he took two of them back and he will soon be upgrading his tank to an 80 gallon.
I plan on cycling my tank in the next week and then im going to get my fish about a month or two after i start the cycling process.i cant wait to get them. And i might probably upgrade my tank to a 120 gallon but im not sure yet if i have enough room for that big of a tank but i will see. I also have a feeling that the canister filter im getting will use up most of my money lol. and im only sixteen so the fluval filter is a lot of money to me lol. But yes i have read a lot about oscars from this website. And i learn stuff i never new like how cycle a tank lol.
for tank mates though i read that if an oscar gets 12in i could get a 6in tank mate but i guess i will just see what happens in the future. lol