When I have enough time, I use my Canon 6D (dslr). I shoot the fish mainly with a canon 100mm macro lens, and for broader shots, I usually use a canon 24-70mm f2.8 L II USM lens.
I recently bought a cobra flash with an emitter to trigger it when it's not connected to the body of the camera. I'm still experimenting with the flash.
Otherwise, I use my Huawei P10.
I recently saw that someone who works for "Diskuszucht Stendker" posted a photo on instagram with the following caption (part of it):
"Please do not take pictures with a flash, because this can make our dicus fish blind!".
I guess that we could say the same about humans...? Has anyone ever heard of fish turning blind because of flashes?
Anyway... Using flash or the artificial light mounted on our tanks or natural light gives different results. I'm far from an expert so I'm still experimenting with this all
Here's a photo of the two main males (?) in the tank:
discus_180722_152.jpg