As discussed, the {{Fishkeeping-stub}} has been created and about 25 articles has been marked with this stub as you can see in Category:Fishkeeping stubs. However, the stub was almost immediately proposed for deletion at Wikipedia:Stub types for deletion. If you want to save our stub, here's what you can do:
Let the stub-sorting people know you're supporting the stub and vote to keep the stub here.
Find more fishkeeping-related stubs and mark them with {{Fishkeeping-stub}} (but please do not mark this stub to the fish species/genus/family articles as they are in the scope of fish-stub)
"Aquarium box" for fish articles. Several wikipedia in other languages have boxes for aquarium care information (temperature, pH, water hardness, size of fish, etc.). Should we apply that to ours too? See more info and discuss here.