I don't have the reference handy, but as I understand it fish(in general? or all?) do see in colour; They have cones in their retina.
Some fish like swimming in the bubbles, I found pictus catfish especially love the bubbles(mine would sit there non-stop, I don't know how he had so much energy...I mean he was a pictus but this was crazy hah!). Also, the current from the filter may be enjoyable to the fish(my betta loved swimming against the current).
Mystery snails breed, but not asexually. There needs to be a pair. One mystery snail will stay one mystery snail, more than one and it's a toss-up.
Some fish like swimming in the bubbles, I found pictus catfish especially love the bubbles(mine would sit there non-stop, I don't know how he had so much energy...I mean he was a pictus but this was crazy hah!). Also, the current from the filter may be enjoyable to the fish(my betta loved swimming against the current).
Mystery snails breed, but not asexually. There needs to be a pair. One mystery snail will stay one mystery snail, more than one and it's a toss-up.