I bought a 10 gallon aquarium and a divider. set everything up and put the stones in the bottom. BUT I have a gap at the top of my dividers and I am afraid that a fish will swim through to the other side and attack the other.. I can't fit my pinky finger through the gap but I am just worried that something bad will happen. can you help?
BTW: The divider is just one that I purchased from the local petsmart and they told me it would work. AND my pinky fingers aren't that big. maybe the size of a pencil or pen.