To round it up, 30L is too small for swordtails and guppies, but adding them to the 100L with soft water fish is also a no. Increase the GH for the livebearers is ok, but not if they are in the same tank with soft water fish.
Either keep the livebearers in the bigger tank without the softwater fish and buffer the GH as you are, or rehome them and stick to fish suitable for your water
Even with the gH having been raised and maintained now, being raised in soft water (if supplier didn’t harden the water) and then being in soft water until December will have compromised them unfortunately and make them more susceptible to diseases that would normally be kept at bay by a healthy immune system.
240L Fluval Roma with Oase 600 Biomaster: 1 German red bristlenose, 4 male cherry barbs, 6 standard rummynose, 3 golden rummynose tetra, 9 emperor tetra, 14 cardinal tetra, 2 hengeli rasbora, 3 nerite snails, 1 adult Sulawesi snail and multiple juveniles continually appearing.
Parameters: gH2, kH1, pH7.4 (tap).
Fish fiend since October 2017.
A simple to use calculator for working out how much to dose of a certain product, based on your aquarium water volume and the requirements of your product.
There are two major causes of fish deaths in an aquarium; new tank syndrome and over feeding.
If you take the time to read this you will hopefully not have to deal with new tank syndrome and you will create a healthy environment for your fish.
Cycling a fish tank can be confusing to beginners and experienced fishkeepers alike. If you’ve already read about it you’ll probably still be confused, because most cycling guides don’t really explain cycling in a manner that’s easy to understand. Here I’ll try to explain in simple terms what is essentially a very simple uncomplicated process.
Algae is a natural occurrence that has been present on Earth for over a billion years, thriving in environments with light and water. In moderate amounts, algae can have advantageous effects, such as utilizing ammonia as a food source, acting as a food source for fish and invertebrates, and producing vital oxygen through photosynthesis.