inspired by some of TTA's comments about using rooibos to stain the water red/amber and for the beneficial sideffects of rooibos (like antibacterial and anti-stress) I wanted to give the rooibos a try.
read more about rooibos and aquariums here: http://www.planetcatfish.com/forum/view ... 48#p278580 (thank TTA for this guys!)
So I went shopping online and found some pure rooibos on Amazon, 1KG, 14€. Not really cheap, but I couldn't find it any cheaper right now, and for a testrun it should be plenty.
Package arrived today. So I poured 3 teaspoons of rooibos into 1l of tapwater and boiled it all together for some minutes.
The "Tea" was quite dark red. I filtered out the rooibos with a kitchen strainer. Some little particles of rooibos were left in the tea. I didn't mind.
After some time for the tea to cool down, I poured the whole 1l behind my HMF and watched it slowly being blend into the tank.
Well, color did change quite a bit. My fish were all going kinda active and searching for food around the tank

I'm not quite happy with the results yet, Guess I have to use more than 3 teaspoons for 400l.
Before: After: Sorry about the crappy pics, only got the smartphone at hand right now

I will watch my fishs beahaviour, but they seem to ba happy with it. So I guess I will add some more rooibos tomorrow.