Have brought a tropical fish tank set up, approx 28ltr tank. Set the tank up as advised, added the 'aqua cycle' and 'aqua pure' as advised. The tank has been in place for 6 weeks! Finally told the water was ready. Added 3 neon tetras. Dead within 24hrs!!! What on earth do I do now in order to get this tank up and running, belongs to my daughter and dont really want to go through fish deaths again. Is the best option to start again? If so any advice? Can I get the tank up and running any quicker?