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rummy-nose vampires

1219 Views 8 Replies 7 Participants Last post by  willbldrco
I have a 90g planted tank with 208W of T5 lighting that turns on from 1-2pm, then 5pm-midnight (I'm a night owl). I have 15 rummy-nose tetras which swim around all over the place when the lights are off (and the room is bright from daylight outside), but as soon as the tank lights come on, they dash off to their little coffins in the plants like aquatic vampires afraid of the dawn!

Normally, this is fine because I'm a plant nut, not a fish nut. However, visitors to my house normally see my tanks and first say, "Beautiful!" then, after a time, "Where are the fish?" It drives me crazy! ;)

So I'm wondering: Do they rush off because there aren't enough fish in their shoal to make them feel secure once "daylight" comes? Should I get 15-20 more? Or maybe a another species like cardinals or neon would provide more of an "it's ok out here in the sunshine" feeling?
Curious,

Will
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Damn! 90G not enough room?? I was going to make them my main school in my 55G. You're talking me out of it now. :frown:
I've got a school of 11 in my 37g and I too do the 5 to midnight thing. Only difference is when my lights come on they won't stop moving. They dash back and forth all along the front glass and even swim near me when I stand next to the tank. What I'm trying to say is I don't think the shoal is too small, bc mine is smaller and they are ALWAYS out. When did you get them? If they're fairly new (a week or two) they still might be acclimating, as mine hid a little for the first two weeks or so. Only other thing I can think of is a predator in the tank, if there is one. They might be skittish bc of it.
how long have you had them?

Also... that is a lot of light!
I had 18 in a 75 gallon, and they would always swim around constantly in a large group. Maybe bump up the group size? Although one thing I never saw was the Rummies coming up to the top. All the food they ate was whatever fell towards the bottom. They would always stay on the bottom. I was thinking there's too much light? I have a 4 bulb T5 but only 2 bulbs on.
If 15 Rummies is all you have in the tank then I'd get some dithers.
I had cardinals that were displaying the same behavior after my platys died. I finally replaced the platys, they are reasonable grazers and aggressive feeders, the cardinals were less reclusive.
I've got a school of 11 in my 37g and I too do the 5 to midnight thing. Only difference is when my lights come on they won't stop moving. They dash back and forth all along the front glass and even swim near me when I stand next to the tank. What I'm trying to say is I don't think the shoal is too small, bc mine is smaller and they are ALWAYS out. When did you get them? If they're fairly new (a week or two) they still might be acclimating, as mine hid a little for the first two weeks or so. Only other thing I can think of is a predator in the tank, if there is one. They might be skittish bc of it.
Thanks for that info!

I've had the rummies for about 6 months. Apart form some Ottos and Amano shrimp, they are the only fish in the tank (no predators). It's just so weird: They casually swim all over the tank when lights are out, but once those lights are on, they are G O N E (run away to the base of the plants). In fact I noticed that they will run deeper into the plants if you approach the tank when the lights are on (like they are scared of my approaceh), but when the lights are off, they don't care if you're standing inches from them. They also come up to feed only when the lights are off.

Bizarre.

I had cardinals that were displaying the same behavior after my platys died. I finally replaced the platys, they are reasonable grazers and aggressive feeders, the cardinals were less reclusive.
This is what I'm hoping the issue is - that they just need some other fish out there to show them that "all is well in the daylight world." :) I eventually want 5-6 discus (I've first been focusing on keeping a planted tank in shape at discus parameters). In the mean time, I'm thinking something smaller like a shoal of cardinals or neons. Or maybe some Galaxy Rasbora if I can find a captive bread source...

Hmmm....

Will
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Followup

I just wanted to follow up on this thread: I bought 18 cardinal tetras and 6 more rummy nose tetras and that has solved the problem! Now when the lights come on, all fish stay out of the plants and swim around doing their normal daily fish stuff.

My thought was to get a different species to create a more community tank feel (thus the cardinals), and then to get a few new rummies to break the "run for the hills" schooling behavior from within the pack. The strategy worked like a charm - even on the first day!

Very happy now. :)

Will
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