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Take some non-flavored alka seltzer tablets and dip them in warm/hot wax only leaving a small exposed portion (like where your fingers were). The wax will slow the dissolve rate of the tablet. Make sure to use soy wax so it will dissolve and will not be toxic to the water or harmful to the fish. Drop one in your hole let it sink and wait. The fish seem to be attracted to the bubbles and I have witnessed it bringing fish into the area. The ice on the lake lowers the oxygen level in the water which makes the fish attracted to the bubbles. This is my conclusion. Real simple, Real cheap. 2nd tip: By a Vexlar!