I always find these types of statements odd. Yes, one can rehome it but one has to ask at what difficulty and at what expense? Point being is that it is rather unlikely that the fish (not tang specific mind you) will happily enter the trap, net, or acclimation box.
- Trap? Some may go in right away (my copperband for example) and some may not (six line wrasse, scopas tang). Ingress and egress may come into play (position of trap, box).
- Night time possibility? Maybe if you find its location and it allows net. What if it doesn't allow it?
- Barbless hook - possibility if there is a food it prefers or mastic.
- Rodeo - net and egg crate method to corral into corner, maybe.
- Remove corals and rocks? Maybe an option.
- Lower display water, remove rocks? Again possible.
One thing all of the bullets have in common as the display ages is that we are now stressing the complete ecosystem if the trap doesn't work. Night time may startle it and cause harm. Removing rocks, corals, or both requires reef structure damage. New system, 1/4" frags - no big deal. Two year old reef with larger coral growth now a concern. Reef structure encrusted with corals or other forms of life a problem.
TL; DR - I understand, and agree, on rehoming. It has or will happen to all of us for a variety of reasons. Rehoming due to future size is one that we can control though and shouldn't be factored into a purchase decision. Regardless of growth speed. In my opinion. Oh - and the biggest thing I didn't mention is the stress and possible frustration that trying to capture causes both parties.
Note: I am not answering the question of can I have a tang or not as the answer isn't going to impact the OP's decision. These threads come up frequently and we all have our bias. I was just responding to rehoming and what could happen when we try.
Hope your day is well.
