I know how it feels to get in trouble for 'just a few more' little fishies.
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I get scolded everytime, and David was livid when I bumped it up to 9 Bettas from 4 in a matter of three days. ($1.99 for girlies! It was like they were giving them away!) I don't even bother hiding them anymore, I just point out his gaming addictionand say 'When you stop playing that thing and pay attention to me, I'll stop buying and paying attention to my fish!' What you do is find his weakness and attack it like a Betta on Bloodworms.
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He'll never know how he lost and you'll be amused for hours on that memory, and happy for years with your new fishie.