Since my last post was months ago, the tank also left behind for months. As seen on the photo above, growth with green spot algae, blue green algae and hair algae too. It's a mess tank, really ugly to present, those hair grass also unhealthy and others too. Since I have some ample time to reset certain things, yes! I did it few days ago.
After spent few hours to make over the setting such as cleared the tank glass wall, suck out the fish waste on the ground, took away the drift wood, washed the canister filter, brew new DIY CO2, and etc. And now it's look clean & clear. The shrimps and snails survive in a less chemical tank, of course there are some new generations too. A serious algae infected tank is very hard to cure, but time to time monitoring is a must, and also the control of fertilizer plays the important role in this stage. Is a bit suffer for me to recall what ever the dosage I did before, so lucky that I had created an dosage calculator(chart below) years ago, now is really helpful for me.
Two days later noticed some of the algae has gone, at least now can see the shrimps & snails eating none stopped. I think need a half tank of water change today, to help to get rid of the algae faster. At the moment I am not going to add in any shrimps or fishes, to prevent the over crowded population for them.
Just redo the chemical dosage calculator, need to run some test before sharing to people. Perhaps if you have some ideas (see from picture), please suggest it to me, thank you. 
