Ya to me it looks too small for 4 rtc also, but i will wait for op to tell us gallons and dims first
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Without having the exact dimensions, please correct on that and I might change my statements below....but....
If I estimate correctly, its going to be way to small for Arapaima. Looks like an L-shaped pond, wrapping around the house.
As said by the OP, the window is 2.5meters, so the total length of that wall looks to be 4.5 meters long.
The short side of the L is around the corner, so that should be around 3 meters long with the depth of the pond around 50 cm.
The pond seems to be on a balcony/terrace. Hope that it's structurally sound.
But apart from that, this pond is way way too small for an arapaima. Even the RTC's might have trouble.
Not sure about cover or sides of the pond, but I see his Pima's jump one day and land outside the pond 1 floor down.
Have a look at the pond I have for my Arapaima. It's 10 x 5.5~6 meters. When I found him, he was 90cm, and 12 months later, he's now 150cm long...and...about 40cm high!!!
With your pond, he'd be scraping the bottom continuously.
He is eating like crazy and growing like a madman. You really won't do yourself or the fish any favors with a small pond like this...
Yes for the Arowana, Peacock, Oscar, but make sure you cover the pond with a net or have high glass/acrylic around the pond to keep them in.
Definite NO for the RTC and Arapaima...
Sorry to sound so harsh, I just think you underestimate the Arapaima. Hope you understand this is well meant advise.
He will have trouble turning around, let alone the depth of the pond causing him to scrape the bottom continuously.
Kind regards,
Luc