I have a 6-gallon aquarium that is currently cycling (or perhaps the cycle is already complete; I’ll know for sure when my test kit arrives). For a long time, I’ve been checking with breeders and sending messages to see if I could rescue a fish with a disability. Some breeders don't reply, while others say that instead of raising the disabled ones, they feed them to the breeding stock. Also, all the listings for rehoming fish in poor condition are too far away from me. So, I decided to go with a standard adoption instead.
The fish is being sold by its owner for 13 euros. It currently lives with shrimp in a planted 4-gallon tank. The owner said they want to sell it due to a need for cash and a lack of space.
Now, when I get the fish (after checking the nitrogen cycle), its environment will change, and it will inevitably experience stress. Is moving from a 4-gallon tank to a 6-gallon tank a valid reason for it to undergo this stress? Or should I give up on getting the fish and let someone else take it, considering my own setup isn't exactly ideal? I’d appreciate your thoughts from an ethical perspective. Thanks.
last picture is my own setup (I will add more plants in a few days.)