Hi callisto168,

So sorry to hear about your fish. Normally the main culprit is the level of ammonia and nitrite in the water. But sometimes fish just died for no apparent reason. Maybe due to the stress, or maybe the fish already have some sort of disease when you bought them. This is what happened to my boesmani rainbows in this tank. After that incident, I am lucky not to get dead fishes anymore.

After a long holiday, it is normal to get some sort of algae in the tank, due to neglect on fert dosing etc. The most I get is green dust algae which I can easily wipe clean using the magnetic scrapper. Usually before I go for a long holiday, I turn off 1/3 of lighting, because nobody around to dose ferts. CO2 as usual. Ligthing and CO2 on a timer. Anyway, hair algae always associated with CO2 issue, lack of it or not stable amount of it.

About showing your setup, we are here to share, learn form each other, at the same time hopefully we can improve our skills on underwater gardening. I am also sucks at this, but we have to start from somewhere...

Best Regards