My sister's fish (who lives in a 1 gallon bowl) hadn't had his tank cleaned in 4 months or been fed in weeks. He had a bubble nest so big it rivaled breeding fishs'.
My fish, on the other hand, is in a perfectly warm, clean 3 gal, but wouldn't make a bubble nest for the life of him.
Sally, I will always love you. You were my babygirl and the gateway to my bettabug. Thank you.