About me I have never been a fish lover or have any interest in "fish tank"(the way I used to call this kind of thing) before in my life. Until recently I bought a 17" all-in-one fish tank for my daughter. At first we only had 6 little gold fish and pebbles at the bottom. Sitting in my living room, looking at the practically empty fish tank, a lot of what-if's came to my mind. What if I add this weird looking fish into the tank, will they survive? What if I add some rocks into the tank, will it …