Main concern is that the fishes should not die...

I have heard/read that keeping a saltwater aquarium is far more difficult that keeping a freshwater one. The main problem is with the marine animals themselves as they are less tolerant to the slightest water contamination and changes, therefore, these should be monitored closely. However, since I am keeping a small hobby tank, I am not planning to buy anything expensive at all and I will be trying my luck with homemade stuffs.

I have read that waste/dead matter decomposes into amonia and nitrates, and little my little, the amount of these dissolved chemicals become higher and the water becomes contaminated. The fishes and animals will started to become ill and die as well. The solution to this problem of proteins and nitrites is to use a protein skimmer so that the protein can be skimmed from the salt water before it decomposes into toxic chemicals. There are quite a lot of information pertaining to the commercial versions of these protein skimmers. However, I do not find much information on a homemade version. After doing some deeper research, I came across an interesting webpage where good and clear information can be obtained on protein skimmers and how they work.

Also, there are plans how you can make a cheap one out of common coke plastic bottles. So, from now on, I will be devoting some more time into finding and making the right protein skimmer as I want my fishes to remain alive. Having them sick, dead and floating around is not a very good scene for the fish lovers and is quite depressing for a first-timer like me. If you want to read more on the protein skimmer, you can follow this link.