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I have read that Seachem Safe is cost effective because it's so highly concentrated, but it's apparently also difficult to measure for smaller tanks below 40 gallons. While I did order Prime, I'm really wondering if Safe is the better choice because it is a cheaper and longer lasting product. But the measuring process is quite confusing and makes me hesitant in buying it because I don't want to overdose my fish. What are your thoughts for a 55 gallon tank and has anyone else used it before?