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After 4 years, half shrimp population gone, full of algae n not touching the tank at all, I see baby shrimps In the tank.

Hi @Enzo Matrix your tank should be cycled if you are getting babies, do they survive?

Do you have any photos of your tank? How often do you feed the tank? Have you changed out any of the water ever? What sort of water do you top up your tank with from evaporation?

Yea they do. I see 2 different sizes. 1 small sized, another batch tiny sized. So there should be 2 different batches of babies

I have stop feeding the tank for months, just top up with distilled water. I don't change anything to the tank or water. Recently there is algae boom and the surface are all greenish.

The little ones

How long are the lights on for and is the tank in a windows? I don’t see much algae on the tank glass?

I have a snail cleaning the side of the tank. Lived for 4 yrs since the start of the tank. All other snails that I got nv survive for even 1 month so I stop buying. Now the snail is big n fat.

The algae is at the water surface.

I kept it further in towards the war away from direct sunlight at the window. So it gets natural light in the morning and lights off at night

I’d just leave it for the shrimp to eat, if you continue to have shrimp die I’d look at maybe some contamination gets in your tank, do you have a lid for the tank?

Yup. It's in the study room so unlikely any contamination., I have a lid too. Only during year 1 and 2, the population went down then stablised at 7 to 8. Never had berries but this week I saw alot of small ones and some young ones so there were 2 batches. It happened that the algae bloom at the surface so not sure if it's connected.

For the snails, nv really understand y they dun make it. The shrimp were doing well but both snails died. Only the one that came originally with the shrimp survived. The rest just died within the first month, bought from aquarium.

What type of snails do/did you have in there? Trumpets? Personally I would not expect snails to thrive in an Opae Ula environment unless all the necessary elements & minerals are present.