Will the brown tips turn green again?

No, the brown tissue is dead and will not recover. You can trim the brown parts off for aesthetics.

Is my plant getting too much fertilizer?

Possibly, as excess fertilizer salts can cause tip burn. Flush the soil with fresh water to clear out the salts.

Opposite-leaved golden-saxifrage: brown tips

Check these first

Check if your tap water is heavily treated or hard.
Feel the soil to see if it has dried out recently.

Likely causes

Water Quality
Possible
How to tell: The very edges of the leaves turn brown and crispy while the rest of the leaf stays green.
What to do: Switch to using filtered or rainwater for your next few waterings. This flushes out accumulated salts from the soil.
Inconsistent Moisture
Possible
How to tell: The tips brown because the plant experienced a period of drought between waterings.
What to do: Ensure you water every 2 to 4 days to keep the soil damp. Do not let the soil dry out completely.

Brown tips on other plants

Find out what's wrong with your opposite-leaved golden-saxifrage

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

If the browning moves inward toward the center of the leaf, the plant is struggling significantly. Minor tip browning is often just a reaction to environmental changes.

Stopping it coming back

Use rainwater or distilled water to prevent mineral buildup.