Chris - Dark toe tips on light colored axolotls can be a sign of sexual maturity.
Is your sponge filter working well for you? If it is then keep it, if it isn't doing the job then you may want to look into a different type of filter.
Possibly? I've heard of males being mature enough to breed at six months old, not that should though. 18 months is a safe time to wait until if you want to breed your axolotls.
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