Balancing circulation for tiny fish - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 03-16-2017, 06:31 PM Thread Starter
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Balancing circulation for tiny fish

Hello. I have a Fluval Spec V with some chili rasbora. These little guys come from mostly stagnant waters, and max out a less than an inch. I turned the output of the filter down to it's lowest setting to accommodate this. However, I definitely have some dead spots in the tank. If it was any other fish, I'd add a powerhead on the opposite side from the filter and call it a day. I don't think these guys could handle any more flow.

So my question is how do you balance proper circulation throughout the whole tank without overdoing it for tiny fish?

Thanks!

I have no idea what I'm doing!
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post #2 of 5 (permalink) Old 03-16-2017, 06:56 PM
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You could try adding a small air stone on the end of the tank opposite the filter output.

You could also turn the pump up higher, but add driftwood/plants/decorations that will help break up the straight-line water flow. That will get you higher overall flow but still provide less turbulent spots for the fish.

I have a Spec V with a betta, some CPD's, and a few others, and I had the filter turned all the way down, but it was too low. I had to turn it up to almost half to get the kind of flow I was comfortable with. I have a fairly large piece of driftwood and quite a few plants to break up the flow though. Everyone seems to be doing ok, including the betta. He still rests up against the filter intake when he's tired, and has no problem escaping the suction when he wants to swim.

Fluval Spec 5gal: Betta tank(A. nana, M. pteropus, C. Wendtii(?), E. argentinensis)
7.5gal rimless cube - S. repens, L. brasiliensis, A. reineckii "mini", R. wallichii - dry started 3/11, flooded 3/25 - will eventually become a shrimp tank (probably CRS or RCS)
10gal - S. repens, L. brasiliensis, A. reineckii "mini", R. wallichii (left over from 7.5gal dry start), C. wendtii, E. argentinensis
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post #3 of 5 (permalink) Old 03-16-2017, 07:39 PM
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I have a spec III that I made a spray bar for. I used the rigid tubing from a sponge filter I had laying around. It just happened to be the right fit for the elbow that pokes through the filter wall. I drilled holes that sent the water in several directions instead of just one,to ensure gentle but sufficient flow. For the cap in the end of the spray bar, I cut some filter sponge and rolled it in a tight coil and shoved it in the end of the spray bar. Here's a link to a great thread on spec mods. https://www.plantedtank.net/forums/9-...spec-mods.html you may find some good ideas in there.
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post #4 of 5 (permalink) Old 03-16-2017, 08:20 PM Thread Starter
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Quote:
Originally Posted by sharkbunnie View Post
I have a spec III that I made a spray bar for. I used the rigid tubing from a sponge filter I had laying around. It just happened to be the right fit for the elbow that pokes through the filter wall. I drilled holes that sent the water in several directions instead of just one,to ensure gentle but sufficient flow. For the cap in the end of the spray bar, I cut some filter sponge and rolled it in a tight coil and shoved it in the end of the spray bar. Here's a link to a great thread on spec mods. https://www.plantedtank.net/forums/9-...spec-mods.html you may find some good ideas in there.
That's a really interesting idea! I'll give that a try, see if I can find something that would work for that. Thanks!

I have no idea what I'm doing!
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post #5 of 5 (permalink) Old 04-12-2017, 04:09 PM
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I have a Spec 3 with chili's and shrimp. I just cut some sponge and put it over the outflow. I then messed with setting to adjust the flow. Seemed to work great. You might want to try that to see if it works for you.

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