Going on Vacation? How to Keep Your Planted Tank Alive While You're Away

Heading out of town? A planted aquarium is surprisingly self-sufficient — but a little preparation goes a long way. Here's exactly how to keep your planted tank alive while you're on vacation, whether it's a long weekend or two weeks abroad.

How Long Can a Planted Tank Go Unattended?

Pre-Vacation Checklist

1. Do a Water Change (1-3 Days Before)

Perform a 25-30% water change 1-3 days before leaving. This gives your tank clean, stable water to start the vacation period. Don't do it the day of departure — let the tank stabilize.

2. Clean Your Filter

Rinse filter media in tank water (never tap water). A clean filter runs more efficiently and is less likely to clog while you're away.

3. Set Your Light on a Timer

If you don't already have one, a simple outlet timer ($5-10) is the single best investment for vacation peace of mind. Set it for your normal photoperiod — typically 8-10 hours per day.

Pro tip: Consider reducing light to 6-7 hours during vacation. Less light = less algae risk, and plants will be fine with slightly reduced hours.

4. Feeding Strategy

• 1-3 days: Skip feeding entirely. Healthy fish can go 3+ days without food easily.
• 4-7 days: Use a quality automatic fish feeder. Set it to dispense once daily at a reduced amount.
• 1-2 weeks: Auto-feeder is essential. Load with quality pellets (they dispense more reliably than flakes).

⚠️ Never use vacation feeder blocks — they cloud water and overload your tank's bioload.

5. Prepare Top-Off Water

Evaporation is real, especially in summer or heated tanks. Leave a covered container of dechlorinated water next to the tank with instructions for a helper, or invest in an auto top-off (ATO) system.

6. Trim and Prune

Trim any overgrown stem plants and remove dead leaves before leaving. This prevents decomposition from fouling water while you're away. Pruned plants also grow slower, which means less maintenance needed.

7. Dose Fertilizer (Optional)

If you normally dose liquid fertilizer, do one last dose the day before departure. For trips under 2 weeks, plants will be fine without additional dosing.

When You Get Home

1. Check temperature and fish count — make sure the heater didn't fail and everyone's alive.
2. Do a water change — 25-30% to refresh water parameters.
3. Trim dead leaves — some plant melt is normal after reduced care.
4. Resume normal feeding gradually — don't overfeed fish that have been fasting.
5. Check for algae — address any growth before it spreads.

Frequently Asked Questions

Will my aquarium plants die in 2 weeks without fertilizer?

Unlikely. Most aquarium plants have enough stored nutrients and fish waste in the water column to sustain them for 2+ weeks. Hardy species like Anubias and Java Fern won't even notice.

Should I leave my aquarium light on 24/7 while on vacation?

Absolutely not — this guarantees an algae bloom. Use a timer set to 6-8 hours per day.

Can I leave my CO2 running while on vacation?

Only with a timer or solenoid that turns it off at night. Running CO2 24/7 without monitoring risks pH crashes. For trips over a week, it's safer to turn CO2 off entirely — plants will survive without it temporarily.