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Optimal lighting duration?


Floater

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Is 12 hours the optimal duration of light for an aquarium?

2x 1200mm 54watt T5 Juwel Day 9000K

2x 1200mm 54watt T5 Juwel Nature 4100K

400L tank approx.

8ml Flourish once a week

10ml Flourish Excel three times a week

Just a plain fine gravel substrate.

Plants I have:

alternanthera rosaefolia

alternanthera rubra

bacopa amplexicaulis

cardamine lyrata

glossostigma elatinoides

heteranthera zosteraefolia

hygrophylla angustifolia

hygrophylla difformis

hygrophylla polsperma

hygrophylla stricta

lilaeopsis mauritana

lysimachia nummularifolia

lysimachia aurea

ludwigia brevipes

ludwigia perennis

ludwigia repens

myriophyllum variifolium

rotala rotundifolia

saurus cernuus

shinersia rivularis

water rose

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