Yay more of my favourite questions!!
When I kept Oscars in my old 80 gallon tank. I did a bit of experimenting, like taking risks to other fishes.
So I found out that Oscars can stay with many different types of community fishes that are a lot bigger than they are.
Like for instance I had a fairly large Black Skirt tetra I kept in with my Oscars, and I was impressed on how well they worked together.
I kept Buenos Aires Tetras, a fantail
goldfish, red eyed tetras, giant pleco, and some bala sharks.
About 8 of each species I kept in with the two 4" Oscars.
Nothing bad happened.
Just when I bought in new smaller fishes, the Oscars wanted to eat the two small phantom tetras.. so I had to put my tetras in quarantine.
I tried putting angels in, but it seems to be like dinner for the Oscars.. so I took out the angels.
Just to tell you, I had kept goldfishes with tropical fishes before, the one that I put in first was the black skirt tetra. Nothing bad happened, and it was a success.
Although goldfishes release a massive amount of
ammonia, and chemicals... it is a big risk to put them in with tropical fishes, unless you have a high quality filter.
I have an aqua clear 100 for my 80 gallon, and I did water changes every wednesday, and siphon the tank every friday.
I did about 10 - 25% a day.
Be sure to put in all of the fishes in the tank first before you put in Oscars, because when Oscars are already in the tank first, and then you add in new fishes... the Oscars will go after your new fishes and probably stress them out to a point that they will die.
Oh, and my key to getting your fishes to survive is...
Lots of love, and care
That's how humans survive with care and love, so I tried the same thing for my fishes and everything worked out
Oh and live plants are the best for removing
nitrite in your water, and ammonia too
Good Luck!!!!