Cory in Fluval Edge - The Planted Tank Forum
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post #1 of 15 (permalink) Old 08-14-2016, 03:15 AM Thread Starter
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Cory in Fluval Edge

I decided it was time to set up a small planted tank. I picked up a Fluval Edge and planted it up. Three dwarf corys and 6 neon tetras got added.

I avoided my favorites (bettas and ADFs) because of the tiny air opening. I've been reefing so long I'd forgotten that corys also gulp air.

Anybody have any luck with corys finding the small opening in an Edge? Or should I rescue them? So far it doesn't look like they're having any luck, and I don't want them to suffer because they can't find the opening.
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post #2 of 15 (permalink) Old 08-14-2016, 03:24 AM
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If you love them, take them out. I had to play musical chairs with my tanks and dropped three Pygmy corys into my Edge. I didn't know they need to breath at the surface. Two died, the third was smart enough to figure out there is a hole. She's still alive, but she takes a minute to remember where the hole is each time she goes up for air. I'm still trying to figure out if she will get eaten in another tank I have (Bettas live in two of them) or if I want to risk losing shrimp. My mysterious shrimp deaths ended when the Cories were evicted from that tank.
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post #3 of 15 (permalink) Old 08-14-2016, 04:50 PM
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I've had bettas and cories successfully find the air hole in my edge tank over the years. You could always lower the water level slightly, which, of course, defeats the purpose of having an edge.
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post #4 of 15 (permalink) Old 08-14-2016, 05:43 PM Thread Starter
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Originally Posted by shhh View Post
I've had bettas and cories successfully find the air hole in my edge tank over the years. You could always lower the water level slightly, which, of course, defeats the purpose of having an edge.
Yeah, it's lowered a smidge right now. Filter splashes loudly though, so I can't leave it like that if it's going to be in the bedroom.

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post #5 of 15 (permalink) Old 08-14-2016, 09:54 PM
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Yeah, it's lowered a smidge right now. Filter splashes loudly though, so I can't leave it like that if it's going to be in the bedroom.

Actually... I always forget there are larger Cories and shorter Fluval Edges. (I was talking Pygmy Cories in the 12 gallon edge.

I say, fill it up and observe them for a few days. They might be fine.
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post #6 of 15 (permalink) Old 08-14-2016, 10:22 PM
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It's not about the tank itself, but this substrate is really dangerous for corys... They need sand to dig in it, sooner or later they'll get hurt.


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post #7 of 15 (permalink) Old 08-14-2016, 10:35 PM Thread Starter
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It's not about the tank itself, but this substrate is really dangerous for corys... They need sand to dig in it, sooner or later they'll get hurt.
I dunno... I've used Fluorite for years with corys and dojos. Never had a problem.
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post #8 of 15 (permalink) Old 08-15-2016, 04:22 AM
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They will love you if you give them a sand patch. My sand bottom cory tank, looks like a moon crater field if lit from the side. They spend that much time digging... and they are only juvenile fish.

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post #9 of 15 (permalink) Old 08-17-2016, 04:18 PM Thread Starter
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Well, the corys figured it out. They still get frustrated sometimes looking for the opening, but they all get there eventually.

I moved my betta in from the craptacular EcoQube he was in. It took him like 5 minutes to find the opening. I'd say the Edge is successful.

Here's a pic of the betta enjoying his new bigger house:



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They will love you if you give them a sand patch. My sand bottom cory tank, looks like a moon crater field if lit from the side. They spend that much time digging... and they are only juvenile fish.
That's not a bad idea. There's a few low flow areas in the tank that a small dish would work nicely in.
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post #10 of 15 (permalink) Old 08-17-2016, 08:40 PM
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What size Edge is that? Those don't look like any of the pygmy cory species, they look like albino cories which are gonna get an inch+ larger (read: 2.5-3 inches) than any of the pygmies (1-1.5 inches) that are appropriate for smaller tanks. You might be able to swing it in the 12 gallon (still not the happiest place for them IMO, but probably doable) but I would not keep them in a 6 gallon tank...
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post #11 of 15 (permalink) Old 08-17-2016, 08:41 PM Thread Starter
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What size Edge is that? Those don't look like any of the pygmy cory species, they look like albino cories which are gonna get an inch+ larger (read: 2.5-3 inches) than any of the pygmies (1-1.5 inches) that are appropriate for smaller tanks. You might be able to swing it in the 12 gallon (still not the happiest place for them IMO, but probably doable) but I would not keep them in a 6 gallon tank...
No they'll definitely outgrow that tank pretty quick. I'm in the process of setting up a 70 gallon tank with a sump. So they'll have a home when they get bigger.
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post #12 of 15 (permalink) Old 08-17-2016, 08:43 PM
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No they'll definitely outgrow that tank pretty quick. I'm in the process of setting up a 70 gallon tank with a sump. So they'll have a home when they get bigger.
Oh, good! I wanted to make sure cos you mentioned them being dwarf cories in your OP, so I wasn't sure if you knew they were gonna get big(ger) :')
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post #13 of 15 (permalink) Old 08-17-2016, 08:45 PM Thread Starter
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They're sold to me as dwarfs. But I can't find anybody who's breeding dwarf albinos commercially, so I doubt it. But even dwarf corys would be too big for this 6 gallon tank. I'll replace them with a couple kuhlis when they get moved.
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post #14 of 15 (permalink) Old 08-17-2016, 10:41 PM
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I'm glad all your fish found the air hole. I love my edge.
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post #15 of 15 (permalink) Old 08-18-2016, 02:19 AM
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They take abut a year to grow out, with quite a burst towards the end, You could easily keep them in a smaller tank while young.
My breeding colony of 6 live in a tank a bit under 15 gal. It is my most stable tank, and the one I need to fuss over the least... apart from hunting eggs.

Heck, I only put a small filter in last week as I decided to keep a few special fry with the adults, ran for months without as I didn't want to filter out the cyclops etc. I managed to keep alive in the tank. Oh and there are 2 pink danio in there as well, they refused to be caught when I moved the rest of their siblings out as fry. They keep the surface and upper areas clean.
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