Sorry for my bad english earlier. I was in marine parade Sam Yick aquarium and saw those mini marine tank for sale. I was using my iphone to pop this question here while waiting for my wife and did not realise posting a question in forum using Iphone is so difficult.
I not going into marine tank as I know is going to spend tons of time. I know myself will not keep that passion on marine tank.
When I ask them on maintainance, they simply just say change water and apply chemical A + chemical B and makes it sound so easy.
They just answer me as long as I am hardworking when I ask them how long these mini tank last.
If is that simple then why would anyone invent expensive equipment as big as a marine tank to simulate the sea environment.
I am a diver, I love to see marine life in ocean. Is nice to see marine tank but is sad to see LFS treating marine life as dirt.
Thanks for all forumer's input.