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According to the Seachem site prime doesn’t expire so what not buy it at the best value??? We don’t have a ton or very large tanks but the value when you get the larger containers is fantastic. Find the space and get the big bottle, it’s so worth it. This is the second time I’ve ordered from Amazon and not problems with leaks either time.
I LOVE this product!! I have an Oscar cichlid and he’s so messy. I feel like I can never keep up but this stuff helps so much! I bought the 4 litre cause I know it works great. Must have for fish keepers