from my experience... when connecting everything use bulkheads rather than pushfit air connectors. i take it this is a diy kit. the regulators shouldent be that expensive. does the solonoid get hot. then put it as far away from the bottle as you can. leave a message here if you want me to mail you some pics of mine if i can be any help just ask.
55US Gallon Medium Planted | 36x15x24Tall
PH 7.0 - 7.2 GH 11
Ehiem 2232 Thermo
2.7WPG 160W 10,000k 5xNO T8's
Sand+Eco Clay, CSM+B Baby Steps + Pres.Co2