rodribike,
you seem to get very suitable water in Portugal for fish/shrimp.
Amazonia substrate is fine if you understand that there will be longer cycle times.
Now lets see if I can give you a brief explanation of what I used to start my last tank.
This is by no means the only way. It's just how I did my last tank.
I chose Benibachi black soil for the substrate.
But before adding the substrate I sprinkled the following on the bottom of the tank.
Benibachi Mineral powder - The product description says "ancient sea mud that improves water quality, replenishes minerals and maintain health of water plant and shrimps." This is used as a mineral supplement and water conditioner during the cycling phase of the tank and thus can benefit the development of the important microorganisms in the filter and the ground from the beginning. Is it dissolves, the mineral powder gives off minerals constantly and thus provides the inhabitants in your tank with the minerals they so desperately require. Mineral powder is supposed to contain many types of minerals.
In addition to all these positive characteristics, it stabilizes the pH value and thus prevents dangerous pH plunges. It sustains total hardness (GH), improves the water quality as well as the ion exchange capacity and provides for better plant growth and root formation, enhancing photosynthesis and the formation of oxygen. It absorbs noxious substances as well.
Main constituents: silicium dioxide 55%, aluminum oxide 13%, iron oxide 4.1%, calcium oxide 3.6%, magnesium oxide 1.6%, sulphur 1.1%, potassium 0.47%, titanium oxide 0.16%, phosphorus oxide 0.07%, cobalt oxide 0.06%, sodium oxide 0.05%, manganese oxide 0.04%.
I'm very convinced that Mineral Powder and any other products that are called Old Sea Mud, Micronekton or Montmorillonite, are just different product names for, this porous clay.
Enough of the mumbo jumbo. why do I add it? As it dissolves it releases the minerals slowly. So the tank has a constant supply of these minerals, especially calcium, magnesium and potassium.
Would I use Mineral powder again? Yes, definitely one brand or another. It doesn't have to be from Benibachi. It depends on what is cheaper.
The next mineral I added was BENIBACHI Super Bacterium BEE MAX.
the product description says "is a mixture of enzyme and chitosan (double of Bee3) which helps to maintain water quality, promotes growth, coloration and molting of juvenile and adult shrimps."
Despite the name of the product, I am not convinced that this product actually contains any bacteria to kick start your aquarium. It's supposed to contain enzymes, but that's a product secret. I don't know what enzymes it has that's special.
But it does contain chitosan, which is a product of processing shrimp and other crustacean shells, funnily enough. It's uses are antifungal and antibacterial.
What it probably does is assist in the development of beneficial bacteria, by providing some nutrients the bacteria can utilise to grow. I don't think it actually introduces that bacteria though.
Why did I use it? Like I said, earlier, I wanted to personally test out these product to form my own opinion of it. I was told this works well with Mineral powder when setting up a tank.
Would I use Super Bee Max again personally? No, not after I finish my current pack.
Since you are in Portugal, see if you can find Glasgarten bacter AE. This product actually seems to claim it contains Lactobacillus and Bacillus subtilis. Which is good bacteria to have in your tank. It's not bacteria to cycle the tank. But bacteria for healthy shrimp.
For bacteria to cycle the tank, I use Prodibio Bio Digest for the bacteria + Bio Trace to feed the bacteria.
The third product I used at the bottom of the tank is Benibachi Fulvic Grain.
Product description is "adjusts water to a soothing parameter of 6~6.5 Ph and GH 4 for crystal bee shrimp."
I only used a bit, as in 1/4 the recommended dosage for a 60L tank. To boost the substrate, as I was specifically trying to get below 6ph for this tank.
This product definitely works. It will extend the life of old substrate for a little longer.
Would I use Fulvic Grain again ? Definitely. Especially to extend the life of the substrate. Replacing substrate is a pain in the you know what. But do you need it to start a new tank? Not necessarily.