quite ok, lot of space to view the shrimp, for future if you will to add in any new plant, test it a one shrimp in a bucket first before put
into your tank as some plant esp the HC seem to leech with pesticide and ferts that fatal to shrimps, you risk wipe out all the shrimp.
In the future you need to cover those filter intake with steel mesh or sponge to prevent shrimplets to be sucked in and killed.

Those fish if too big will target the shrimplets but will just reduce the breeding rate if you have enough space for some baby shrimp to hide.
else remove is also a good option, however you can keep them with smaller sized fish like dwarf or spotted rasbora.
The rule is if the fish mouth big enough to fit a shrimplet, they will eat them.
Of course aggressive in nature fish is a NO NO in shrimp tank.

Your temperature may on the high side as running two filter will contribute to higher temperature, and you may as well run a bigger filter.
adding a aquarium fan is always an option.

yes, they also known as crayfish, their easy but mine all died due to neglect.

Me too. 
Youliang , if you couple Malaya with palmata shrimp in one tank, you will have mutlicolor shrimp tank that wont cross/interbreed.
Malaya change color, Palmata born different color baby, what a opposite match.

Crayfish , Of course if have = better.  if not they make do without but need to frequent change water, don't like me neglect them till they died without water change for 4 mths.
~Palmata , mr.google will help -> http://swisstropicals.com/Neocaridina%20palmata.html
only got picture here, without a clear description , so far different site give different info, but from my experience in keeping/breeding them
they do give birth to different color baby.
~I got red , blue , black, green and chocolate baby from a green male and green female adults, you can selective breed them by separate a certain color babyin a tank to breed to get that particular color only, so far able to do that with black and blue color.
~Of course when i sell the juvenile palmata, i wouldn't give those black & chocolate as those fetch higher price then other color , market price is like rm12-20 for chocolate & black per tail.

These are Lava rock(same as valcano rock) , bad as filter media cos low surface value for bacteria to colonize,
we normally use it as soil base to increase soil height or as base to tie moss and plants.

Guys...how do you replenish the water ?

Store some tap water in the bottles first ? cos I was told fresh tap water is dangerous .

ADA Tourmaline? if you want to reduce ph the safe and long lasting way, use plant or shrimp soil, if really Tourmaline can reduce ph! how many you need to dose and how long can it last?

Unless you are into keeping CRS , no need to worry much about PH especially for neocaridina type shrimp like fire red etc, they only require stable ph of range ph5.5 -8.2.

although  JBL Tormec Activ like sera super peat can reduce ph when use as filter media, it is not a long term solution as it effect only last 3 to 6 mths and there is fluctuation when near end of his lifespan, which make it not that suitable for CRS tank which need constant stable parameter, shrimp soil can provide that stable ph buffering for at least 1 to 2 year. 
Don't ever use Ph down products for shrimp tank especially for crs as this ph down only provide temporary effect.
Any fluctuation in water parameter is proven fatal for sensitive shrimp like crs.
There is no shortcut in keeping sensitive shrimp like crs.

dead shrimp , after few hour body left in the tank, all will be soft and start to rot.
Shrimp died after molting the body will be soft and their body after molting is prone to attack from fish and affected more by tank parameter.
Shrimp normally mate after molting that why certain times a shrimp be swarmed by others.

Third Try : Project Sulawesi.
NO coral stone/sand , with just lot of mineral and lot of algae.

Bro, how are you!

We need some info about this neocaridina killer tank, PH , GH , TDS ?
Neocaridina can adjust to different parameters readily , just that TDS if too low(below 160) can pose some problem
for them.
Its they died after molt?

I am interested to start out with some "easy" shrimps...

can any1 tell me what is the different of...

Caridina cf. babaulti shrimps

Caridina Sp. Malaya shrimps

any1 have experience on breeding such shrimps...