"Speedish Fish" is supposed to remind people of the candy called Swedish Fish (which I have never eaten).
Yes, tank the lighting is purplish. It's also set to a low intensity to avoid algae growth.
We don't tap on the "glass". It's thick acrylic, so who knows how much it transmits. Besides the orange fish will come to the side when they see someone.
Has anyone spotted the catfish behind the bubbles or the clock display? There are two angelfish at upper right.
What a great idea. And nicely done.
I'll guess that if they are just "hangin" that a sharp tap on the glass will set them off.
You could probably be at this all day if you just wanted to play with all the parameters at your disposal.