today i got a light for my new aquarium, and as soon as i turned it on my emerald cory went into his driftwood hideout and stayed there. turned the light off, twenty minutes pass, i go and check on them, and he's out of his cave. does anyone else have corys who don't like lights?

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29g planted, Eheim 2215 canister, Top Fin 150w heater.

Albino Cory x 4, Guppy x 8, Oto x 3, Bolivian Ram x 2

I experienced the same reaction from my fish when I first switched from traditional fluorescent lighting to T5HO. And it wasn't only the Corydoras in my tank that avoided direct exposure to the new, more intense light. Every fish seemed to want to swim under shade. My tank was well planted and there was enough places for the fish to go..

Good morning n...

Corys originally come from well shaded streams of South America and the Amazon. So, that may be the reason they're light sensative. I have several different kinds of Corys and keep them in heavily planted, large, low light tanks. Even in low light, they're not extremely active and prefer the shaded areas. When the tank lights go out, then they're very active and the rest of the fish go into their "sleep mode".

If your tank is well lit for the benefit of your plants, then you need to float Water sprite or Water wisteria in a corner of the tank for shade. I have a lot of Cryptocoryne in my tanks too. This plant grows into a medium sized ground cover, a good hiding place for Corys. Provide some shade for these fish and they'll be more comfortable.

Just a thought to consider or not.

B

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Low Tech Water Building Keeper

Hi guys! I have recently bought corys, but I'm not sure I take care of them correctly..What are the main rules of taking care of these fish?

As long as you have plants, that in of itself will produce some shade. I don't float any plants and have several species of Cories. I think mine have become accustomed to the lights I have and some are pretty intense. Your fish just may need some time to adjust to it.

That's weird, mine is always in the open light, searching for shrimp pellets
(yes he does have many options for hiding.)

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20 gallon semi planted:
Filters: top fin 10 and 20 power filters.
Fish: 2 panda cories, 1 peppered Cory, 5 kuhli loaches, and 4 cherry barbs.

all of my cories are very active in both my tanks, granted the light is generic LED that comes with the aqueon setups, but the light is bright. i did notice some hiing when i first got these guys, but i and second dotfrog's experience, mine always have their barbels in the substrate looking for shrimp pellets and algae wafers. they only go in the shade to take a break or to sleep (usually dogpiled on eachother)

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RIP "whitey" my albino pleco. found dead 5-21-12

29 gal- 2 leopard ctenopoma / 5 tiger barb / 5 corydoras catfish / 1 golden weather loach / 1 three spot gourami / 2 bolivian ram / 1 juvenile bristlenose pleco / Amazon sword / Java fern / Red Ludwigia / Wisteria / Anacharis
filtration- AquaClear 50, QuietFlow 20; 325 gph total

20 gal- 1 clown pleco / 8 black neon tetras / 1 neon dwarf gourami / 4 Asian glass cats / 5 green corydoras catfish
filtration- QuietFlow 30; 200 gph

I have 2 Albino Cory's that don't mind the light and 1 that hates the light

Maybe the one that doesn't like the light just needs to wear sunglasses?

My cories hate the light too and I have plants for them to hide in plus lots of floating duckweed to tone down the lights. I've thought of going 'lightless' but in these dim winter months I wouldn't be able to see much in the tanks so cories continue to hide.

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10g lightly planted with vals, crypts, anubias and one female betta.

75g lightly planted with 8 neon tetras, 7 black-skirt tetras, 7 Swartz' cories, 1 Bolivian ram, dozens of rcs, hundreds of mts, and four assassin snails.

I have cories that dont seem to mind the two 54W 48 inch T5's in the 55G tank. They are actually pretty bright since I use marine lighting in a non planted (real that is) but they sure arent shy when they have their one meal of the day. I have a three little speckled ones though that are always hiding. The others are out and about most of the time.

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Hoopman
Sunny Orlando FL
55G W/Angel, loaches/cats, tetras, rasboras, Two Bio Wheel 350's (8 cartridges and 4 wheels) Dual T5 ATI bulbs which are blue & blue-plus (white), give a saltwater tank look/moons. - 37G w/Angel, Mystery snails, tetras/cherry barbs. Dual 24 inch T5 with same ATI bulbs/moons. Bio wheel filter (dual cartridges and one wheel) and Aqueon single filter Bio cage cartridge, both designed for larger tanks. n

I've now had these same set of 4 corys in three different tanks who's light range from high to low. In all tanks these corys are playing both with the light on and off.

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100 Dirt + Stuff. To be Angel baby tank.
37 Planted. http://www.aquariumforum.com/f45/pla...nal-20774.html
29 Tall community tank. 5+ Years up and running.
15 Soon to be RCS tank.

Yes, mine do the same thing. I moved some plants around so they would have more places in the shade but it is disappointing not to see them out when the light is on. I have floating plants which I hoped would help tone down the lights (coralife 6700 x2) but that doesn't seem to help either.

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10g lightly planted with vals, crypts, anubias and one female betta.

75g lightly planted with 8 neon tetras, 7 black-skirt tetras, 7 Swartz' cories, 1 Bolivian ram, dozens of rcs, hundreds of mts, and four assassin snails.