View Full Version : Dangerous natural gravel from

01-22-2005, 06:26 PM
I just discovered something kinda scary today. I purchased one of those magnetic glass cleaner things. Anyway it was not of the floating type. I was cleaning and it feel down onto the gravel and to my horror, it started picking up the gravel!!! Not just one area but anywhere I would touch it to the gravel. This means the gravel has tons of iron in it which I assume would be bad since it will corrode in the water.

The gravel is the natrual slate red kinda colour which I picked up from Big Al's. Its supposedly their own brand. If any of you have that stuff, test with a strong magnet. This cant be good for the fish.

01-22-2005, 06:33 PM

01-22-2005, 07:45 PM
You might wanna change the title of the thread to something like a warning re natural gravel. Don't wanna get the site in trouble by getting sued by Big Al's.

01-22-2005, 09:16 PM
Good call. Changed the title but I still want to know where the gravel was picked up from...

01-22-2005, 09:34 PM
Its also good for others to know where I picked it up from so they can inquire about the gravel. Heck maybe they should take a magnet when buying the gravel :)

01-23-2005, 06:02 PM
I assume since it was called 'natural gravel' is was not epoxy coated? If it is coated, like typical LFS bagged gravel, then it shouldn't make much diference. Get some, put it on something that is waterproof and disposable, get it wet, and let it sit. try to keep it wet, but exposed to air, for a few days, and see if any rust forms. If not, you probably are OK.

01-23-2005, 10:08 PM
Well I know for a fact that its not coated and as long as its not coated, the minerals like iron in the rock will be exposed to the water. Thats not so good. I'll be looking to change my gravel soon. Not an easy job.

01-23-2005, 10:23 PM
Have you talked to Big Al's about it? They might not know they're selling bad gravel.

01-23-2005, 11:34 PM
I was going to talk to them soon. I found this out on the weekend. I will probably go there on tuesday to get some fish food. I'll take a magnet and a sample of the gravel and show them what I found. I'm almost tempted to ask them for a refund on the gravel. Heck I purchased 4 25lb bags of this stuff, although they are all used now.

01-24-2005, 05:33 AM
I would definitly ask about a refund or at least store credit. You just bought 100 lbs of gravel that isn't any use to you.

z rock
01-24-2005, 07:56 AM
I would take the magnent with gravel stuck to it with me to the store.
The red color would be an indicator it contained iron. Sounds like it would be good for plants. Strange.

01-24-2005, 12:02 PM
Sounds like you picked up bags of media for a planted tank. Plants require iron to grow and other minarails. So just check it out i belive thats what it is intened for.

z rock
01-24-2005, 04:20 PM
Still, it doesn't seem even a plant substrate would have so much iron it would be magnetic. I have Seachem Flourite in a plant tank and it won't stick to a magnet. If it sticks to a magnet it would have to rust. That couldn't be a good thing.

01-24-2005, 06:22 PM
I decided to take a few fast pics of the gravel and the fish. Sorry for the blurry or bad pics. Also the fish appear to be cramped but the tank is a 100 gallon but the cons tend to be aggressive and cause the fish to huddle in one half of the tank. The mellow oscar excluded but even he has to watch his tail once in a while....



Cant wait until I get the 220 gallon and do the tank right and get rid of the horrible background...

01-24-2005, 06:25 PM
Let us know how things turn out!!!!!

z rock
01-24-2005, 08:07 PM
Magnetic gravel? Thats one of the more bizzare things I've ever seen!

I guess the Convicts are kinda "touchy" with all those babies in there. It's ammazing the oscar hasn't eat any of them.

What is that one large fish? The punkinseed, sunfish, perch?

z rock
01-24-2005, 08:22 PM
When you go buying substrate for those large tanks it's MUCH cheaper to get that poolfilter sand stuff. It's about $8 US for a 50lb sack and after you get done rinsing very little washes out in the yard.

Should be able to find some cheap pea gravel at a rock/landscaping/stone, yard that would be better than the magnetic stuff.

01-24-2005, 08:22 PM
Actually the cons are very aggressive. Nobody even gets close to the babies. I have only thrown in feeders 2-3 times in their lifetime and even then, they were not very aggressive with them. The oscar had a few and so did that sunfish thing...

Speaking of the sunfish. I have no idea what it is. I got it when it was about 2.5-3" long from a LFS that was going to throw it in with some big fish as feeders. I rescued it. They have no idea what it is. Said some customer brought it in after catching it in a pond or lake here in Toronto. I'd say its around 5.5-6" long now. The oscar is around 10" long. Silver dollars around 5" or so.

Everyone other than the cons are very mellow. Nobody fights with anyone.

z rock
01-24-2005, 08:33 PM
I've read that convicts will gang up on and run off larger Central Americans in the wild. There on the Central American Cichlid hall of fame.


01-24-2005, 08:52 PM
The sunfish pictured is the common blue gill. Lepomis macrochirus. Good lookin brood!