punchiechip
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Good input from everywhere here! A female flowerhorn can get pretty big but might work better in a 75. They're underrated and colorful too! For an Oscar you'd want to go 6'. It takes my oscar 4 feet just to stop at full speed. Maybe 5' but only if it's boxy asf...like a funky 4' x 2 'x5 'custom build cubeish.
My red oscar Brick is currently 5 y.o. I'd run out of adjectives to describe his personality, but he's loads of fun when he isn't cranky. His size is 3.5" W x ~7"H x 15"L. Estimated weight 2-3 lbs. Be prepared for water changes and monstrous turds unless you have great filtration and water movement. Best thing I did recently was add real plants. It can work with O's but there's a method to it.
I think because FHs have to be isolated there isn't as much chance of seeing their full personality because they can only interact with one source. Most Oscars can have at least one tankmate so you see their range better. One thing about oscars rarely mentioned is that they will use all levels to swim in, so the need for space is crucial in addition to water volume.
Here's Brick...isolated current shot and in the 225:
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