How often should i replace t5 bulbs over my aquarium?

T5 bulbs typically need to be replaced every 12 months for optimal performance, although this can vary based on usage and the specific type of bulb. Over time, even if the bulbs still emit light, their spectrum and intensity can degrade, affecting plant growth and overall tank health. Regularly monitoring the health of your aquatic plants and corals can help determine if it's time for a replacement. Consider keeping a schedule to check the bulbs or set reminders for replacement to maintain the best conditions in your aquarium.