hi stanley
test your tank water again...cos if your KH is at 4 to 5, you should have seen a blue solution before the yellow....rinse the valve and dry it will. ensure that there is only 5ml of water (make sure that the lowest point of the water is at 5ml..as water in any cylinder will create a U-shape). shake the solution well....and drop...count the number of drops and the total will be the KH reading.
Is your fishes gasping at the surface? They should be by now coz at KH 4 to 5, the 'correct' PH for CO2 rich water should be around 6.5 ot 6.6...at 5.5 you have way over injected CO2....Should you PH be correct at 5.5, than you KH will be at 1 or near 0.
If your fishes are gasping at the surface execute a 50% water change and stop CO2 injection. If your KH is at 1 or near 0.....add baking soda or KH up powder to increase KH level...never raise the KH by more than 2points within 24hrs.....suggest is that add 2 teaspoon at a time...dissolve it well and pour it evenly round the tank...wait an hour and take the reading again.....continue the process till you reach your 24hr quota.....ideal KH level should be 4 to 5.
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