I've never been angry at the Petco people. They mean well, are sometimes knowledgeable, and I take everything they say with a grain of (Epsom) salt!
Yesterday was the 1st time I got mad. I stopped by my nearest Petco to see if they had baby snails for my girls to snack on, plus I wanted a few more plants for the tank.
No snails, but I asked the fish person on duty to pull 3 nice plants from the plant tank for me. He asked me about my setup. I said 29 gallon, 9 betta girls with at least 10 more plants. He advised me to buy a CO2 injection system b/c I have "too many plants."
I told him "thanks but no thanks" and left w/ my plants.
I suppose he was just trying to make an additional $50+ from me, but I can't escape that nagging voice saying I need that CO2 injector....
Any thoughts? Is there a test for lack of CO2???