Resident Aquarium Nerd
Join Date: Apr 2004
Location: Murfreesboro, TN
Prime doesn't remove phosphates, they may be present in your tap water. They aren't really harmful (for your tank) but they'll fuel algae growth. There's no need to go crazy trying to remove it, though, unless the algae is really bad.
I would aim for a weekly water change (and try to vacuum every time, frogs are messy!) and see if that helps. How much algae is there? Remember, some algae is normal. A sterile aquarium isn't a healthy one.
There's no real ideal pH level (although you want to avoid extremes). Instead, make sure it's stable. See what it currently is and keep an eye out for changes. Acidic water (pH under 7.0) can be a pain to deal with because animals can become more prone to disease and the beneficial bacteria don't really thrive. But even that isn't a death sentence or anything (if it was acidic enough to kill your frogs you probably wouldn't be able to drink it).
"We weep for a bird's cry, but not for a fish's blood. Blessed are those with a voice."
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