Can There Be Too Much Light?

[NewTankGuy]

I have a 75-gal slightly planted tank.  I have about 7 plants, and 2 moss balls.  I have just over 40% of my substrate the type with fertilizer in it, and I also just started using Excel, and Flourish when I added the last 4 plants as I just did that about a week ago.  For my tank I have a 36” Marineland Double Bright LED Lighting System (6000K one watt white and 60mW blue LED lighting system) covering the back of my tank were the new plants are mostly located, then in the front, I am using my old 24” florescent light with a 20 W T8 Power-GLO bulb.  So my question is, is this too much light, or am I on the right track and the extra light is going to help the plants?  Also I am concerned over if the excess light would hurt my fish?  

 

[nickwhite]

I would experiment with different set ups. If your tank gets covered in Algae very quickly or your water turns murky then you may have to much light. If the plants are not happy then try less light. Personally i maintain my aquarium with the minimum lighting required to maintain a happy tank, then when guests come round i put on the t5's. Less lighting means less algae which means less tank cleaning. I know my local fish store operate much the same way on certain tanks during quiet periods. There are many websites that will have great articles on lighting such as www.fislore.com or www.fishforinfo.net. I visit these quite a lot when i need aquarium advice. Plus there are lots of youtube videos that discuss the subject in great detail. Aquarium lighting requirements are different for different plants. Plants which live near the surface require more light from the white spectrum. Deeper plants will prefer your power glo. Research your aquarium plants or ask at your local aquarium fish store where you purchased them from. They will help you

 

[attibones]

In addition to the above, I would like to add that for the most part, fish don't mind the extra light. However, there are many species of fish (dwarf puffers, chili rasboras, several species of smaller tetras, loaches, etc) who prefer shady water. Shy fish are more likely to feel at home in a dark or shady environment. However, some species tend to get nippy in darkness (usually when all lights are out) due to more nocturnal behavior or feeding patterns.

 

[Freedom]

How long are the lights on daily?  Are they on a timer, or are you turning them on and off?  The difference being, a timer will be routine (more what fish are used to) and you doing it will be more random.

 

[Zikofski]

u can't really have to much light, as far as i know i have 30 x 3w LED's in my 88L (23g) tank which most would see as being a lot, my plants seem to grow well, i am injecting co2 and dry dosing EI method, as this is a high tech setup, no problems so far, i have recently added fish altho they prefer shady water they do come out now and then but do stay hidden under the plants but as they get used to the tank and my plants grow to cover more of the tank i think they will come out more. but no u can't really have to much light IMO

 

[Tongue_Flicker]

u can't really have to much light, as far as i know i have 30 x 3w LED's in my 88L (23g) tank which most would see as being a lot, my plants seem to grow well, i am injecting co2 and dry dosing EI method, as this is a high tech setup, no problems so far, i have recently added fish altho they prefer shady water they do come out now and then but do stay hidden under the plants but as they get used to the tank and my plants grow to cover more of the tank i think they will come out more. but no u can't really have to much light IMO

Seconded..