As Explained previously i am on Christmas Island and the opportunity to get fish like discus is very rare. A local trader has 12 discus she is wanting to sell and has promised to hold them for me. I wanted to go look at the fish so i did and was shocked to find them living in a tank with slightly greenish water. I asked the hubby who does all the fish tendering what ph was and he said he didn't know he just added our tap water 50/50 with rain water and they fine. our tap water comes in at 8 so would he be correct in doing this? They are also going away in 2 weeks and said they want me to pick them up b4 they go but my tank will have only been going for 3 weeks should i risk this? I have 1 goldfish & 2 guppies in there to help start cycle. I have access to endless amounts of gupppies should i just wack a whole heap in tank to get it going or will this make no difference? The fish are about 2-3 inches in size and he fed them in front of me and they all looked quite happy. He has no heating and said the temp of the water here is fine as it is like their natural conditions. They have been bred at a fish farm in malaysia, this is a tropical island with wet and dry season. My tank is inside and he reckons i will not need heating. I am a little worried about the fish and if there is anyway to get my tank ready quicker please will someone let me know i know there prob isn't but i feel sorry for these fish and would like to get them out of there ASAP! he has many other tanks and fish but all tanks look green and yuk. The discus tank is also covered in black plastic on the top and halfway down the sides why is this? I am desperate for some answers please HELP.