i have 2 fw tanks my beginner6gl eclipse and a 30gl with all barbs...i was thinking of trying the 6 gl as a sw tank...is this too small to try are there small fish that would be happy in a 6gl tank...if so where do i begin to look into this setup..are there good websites i can learn from before i try....a beginning kick in the *** would be great...like what type of filter i need or gravel ..stuff like that...thanks