Good Evening! I'm Mary (under the name Seasugar) but I'm trying something new. I've always had plastic plants and I'm trying to learn how to have live plants in my aquarium. So far so good but I'm totally lost on the C02! I'm using fertilizer but they are getting a few brown spots but still looking good. I've read everything I can find about the C02 and if anything it's got me more scared than anything to use it for fear of loosing my fish! I only have a dwarf gourami, 2 clown plecos, and an albino catfish. I will be adding more soon. My tank has been set up for around 5 years now. I'm not looking to add a pressurized C02 setup. I've looked into C02 in the bottle but I've till yet to find what I need to add to a 50 gallon tank. I will loose my plants before I loose my fish. Hoping for some help in that area. I've had aquariums all my life but I've never tried to grow live plants in my aquarium. I have a bubblier in my tank because I like to see the bubbles so I'm sure they have plenty of oxygen but reading about C02 it sounds like I could suffocate my fish using it!! Anyway, it's nice to meet you all and I hope to fit in well here.