Ammonia spike, cloudy water and white critters

[DEL 707]

I have a 55l nano planted tank.

Stock is:

10 Green Neon Tetras
3 Amano Shrimp
An army of Cherry Red Shrimp
2 Nerite snails

Today my tank is very cloudy and has diatomes on the glass. Also 1 dead cherry shrimp, an adult female.
I did an ammonia test and got a reading of 0.25ppm. I've immediately done a 20l water change.

I use RO water which I reminerlise with Salty Shrimp GH/KH. The confusing thing is that I did a 20l water change on Monday!
I have changed my water supplier, but I checked 1 of my containers and got a reading of 2ppm.

Also there are these white bugs moving about on the glass which I can't say I've noticed before.

Any idea what these are?

 

[JuiceBox52]

Cant say about the bugs but the cloudy water is likely a bacterial bloom

 

[Metalhead88]

how long has the tank been set up?

 

[DEL 707]

Tanks been up and running for 6 months.
Fish have been in there for 4 months.

 

[Retired Viking]

Could be copepods or isopods that feed on algae and left over food and waste.

 

[Barry Tetra]

do daily water change and see if ammonia have go down.

 

[DEL 707]

Unfortunately, I've thrown in the towel.

I did another water change at 1am but it didn't help, shrimp dying and fish gasping.
Did the only thing I could do, saved who ever I could and took them to the local fish shop.
Tanks now completely empty.

I just wish I knew what caused it all, I tested my RO water and come back with 0 ammonia.
Could it have been a build up in the gravel? Because of the plants and the wood, I wasn't able to properly gravel vac.