What are those? Are those black pacu? Those look like beautiful fish, nice catch. I have read they get too large for any aquarium or even reasonable ponds.
The Red Bellied ones get between 2 and 3 feet long, I knew this when I got them only a couple weeks ago at about 3 inches long and thought I'd have a few months to order acrylic sheets for a laaaaaaaaarge aquarium. Not so. They are now 6 and 7 inches long and I have tuition to be responsible for this quarter so no big thick acrylic sheets, thus the pond plan. I have the liner and a 1100 gph at 7 foot head pump to drive a diy tote bin filter. These things grow like literally an inch a week! They are in a 48 inch tank now but the pond will be above ground 8 feet longx4 feet widex36 inch deep (filled to 30 inches) and I'll upgrade it if they ever seem to lack space. Hoping to finish the pond next weekend, I don't know when I'll pick up my wood. My mother is allowing it in the house due to my career and school choice. The pond will be up for 2 to 3 years down there before I need to move to go to vet school, by then they might need larger digs anway. I don't really expect them to reach 3 feet, that's kind of a wild size with plentiful food. Then again i am going to keep their water very clean. At the moment I have to do 50% water change + vacuum every 2 days to keep their tank clean. If they get too large I will building another pond again or find them somewhere humane to live.
The water changes I plan on will be 300 gallons weekly. No heating required cause the room is sitting at 75. Oh and my bedroom is in a basement, the floor is a concrete slab so weight is going to be okay. Ive found the DIY section of this site really helpful especially the filter stickies. I never thought of using some of those types of media. I have a lot of leftover ceramic rings, gravel substrate, and stuff from all my aquariums that I can use as media but i'm definitely interested in the strapping noodles.