well i got all my new plants and replanted by removivg all fish and replanting. first i noticed all my fish at top gasping so i rushed in an air pump for now and i noticed my co2 not bubbling yet. when i opened it to see if all was ok water came running out. i dont have a check valve anyideas. does it sound like a co2 problem? i just got off the phone with aquabotanics and they say the weight is okay to plant but im removing mine i left two on just in case. anyother ideas. thanks. i gotta check on my fishies. where can i get a check valve?