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Corydoras acting wild


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I bought one of the value packs from liveaquaria.com and it came with 3 cory's. It's been a short time but they're acting pretty wild by swimming fast up & down on the front glass. All the one's I've seen in the stores just chill out at the bottom. I do feel like the current is too much in my tank as I have a Fluval 306 in a 27g cube tank so I wonder if that's the issue? 

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Because they spend so much time on the bottom, corydoras are less affected by current than your other fish. I have angelfish, so I am also conscious of keeping the flow at a level my fish can tolerate. A lot of plants (real or plastic) and structures (wood, rocks, etc.) can help interrupt the flow and create some calmer spaces.

I think high flow rates are overrated. The volume/surface area of your filter media is more important than a high flow rate. If your flow rate is so high that it is bothering your fish, then maybe you should make a change.

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I have a good amount of plants/decor but it doesn't seem like it has an affect on the current imo. I think the issue is the square design so there's no real dead spot. With a rectangle footprint I feel like dead spots are easily attained. The fish don't seem bothered but it does look like they're constantly swimming

64677828890__87646A5A-D747-48FC-8F19-8F91CB64D8DC.jpg

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I knew it. Unfortunately there's no adjustment. The filter came with the tank and I believe the previous owner had a saltwater setup which explains the high output. I know piranha's benefit the most with a high output but this is my first community tank so I did suspect 11x was too much from the beginning

I have been thinking about adding a sponge filter to the inlet though. Not sure what I can do with the outlet, maybe add some holes?

Thanks

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On 7/1/2021 at 12:01 PM, Fresh said:

I knew it. Unfortunately there's no adjustment. The filter came with the tank and I believe the previous owner had a saltwater setup which explains the high output. I know piranha's benefit the most with a high output but this is my first community tank so I did suspect 11x was too much from the beginning

I have been thinking about adding a sponge filter to the inlet though. Not sure what I can do with the outlet, maybe add some holes?

Thanks

I doubt your flow rate is going to bother cories.  Some seem to really enjoy playing in current.  Don’t worry, the intermittent dashing around is perfectly normal.
 

That being said, adding holes or finding tubing that fits and doing a custom outflow can work.  You can also create a baffle around the outflow to disperse the flow.  They make pre-filter intake covers that should be fairly easily adapted to be a baffle over an outflow.  Some are intended to go over a sponge pre-filter, some are just a wide, screen type pre-filter themselves.  You won’t need the sponge filter itself, just the cover or screen pre-filter.

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On 7/1/2021 at 1:43 PM, Odd Duck said:

I doubt your flow rate is going to bother cories.  Some seem to really enjoy playing in current.  Don’t worry, the intermittent dashing around is perfectly normal.
 

That being said, adding holes or finding tubing that fits and doing a custom outflow can work.  You can also create a baffle around the outflow to disperse the flow.  They make pre-filter intake covers that should be fairly easily adapted to be a baffle over an outflow.  Some are intended to go over a sponge pre-filter, some are just a wide, screen type pre-filter themselves.  You won’t need the sponge filter itself, just the cover or screen pre-filter.

I just realized the on/off valve is actually the flow control valve 🙈. I did a search and came across some articles talking about it, I feel like an idiot lol. I will set it halfway when I get home and see how it goes. I might still get the sponge filter though

Thanks!

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If your filter is using a spray bar, point the spray bar backwards toward the glass, and it'll help tame the current. Or you can drill the holes out larger. I drilled mine AND face it toward the glass, and it calms things down a lot. I have a 407 on a 45g bowfront, and my cories aren't ever bothered. Sometimes they'll actually swim up the glass where the current is. 

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On 7/1/2021 at 11:18 AM, Fresh said:

I have a good amount of plants/decor but it doesn't seem like it has an affect on the current imo. I think the issue is the square design so there's no real dead spot. With a rectangle footprint I feel like dead spots are easily attained. The fish don't seem bothered but it does look like they're constantly swimming

64677828890__87646A5A-D747-48FC-8F19-8F91CB64D8DC.jpg

Wish I could gt my substrate to stick to the top like that.

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