Define "super small".
Depending on the pond's size, and your budget; and since it has leakage issues, you might seriously consider draining, removing accumulations of detritus and then sealing the pond's re-established bottom with incorporated bentonite clay before restocking it with water and fish.
Leakage and "small pond" are never a good combination, especially when fish are involved - and especially in Texas' summertime heat and unpredictable rainfall patterns.
