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Cory Help

1162 Views 7 Replies 4 Participants Last post by  Corydoradinae
Hello,

I've had a well-to-over-stocked, sloppy planted/algaed 37 high tank going 2 years. It's had weekly 50% water changes w/ light vacuum. There are small areas that have never been vacuumed because of the plant cover. Absolutely stable parameters. My water is hard and 8.3 ph out of the tap. lt gets DIY CO2 and dry ferts. I don't use R.O. The substrate is a fluorite/gravel mix.

I recently sold the 3 angels I had that grew to large adults, fought like mad, and ate my neons. I assume they were same sex. Right now I'm down to 5 RNTs, and 4 molly my daughter insisted on. (in their defense, they eat algae constantly and make tons of angel fish snacks), and a thousand tiny/micro snails.

I want to get a school of small cory...panda or smaller. Considering that cory like good water, what would be better for them?

1. Dropping them into this tank w/ 2 years of processed shirt in the gravel? Could I get away with this? A huge plus would be no work and no messing w/ plants. -plenty of waste-breaking-down bacteria already in the house.

2. Pulling everything out of the tank and re-do it with pool filter sand substrate, and re-plant? I'd keep the dirty filter, a little of the old gravel, and all the plants so I don't have to cycle.
-Upside...2 yrs of mulm gone, generally cleaner substrate, possibly better substrate for cory digging?
-Downside...major PIA.

3. Better idea?

4. Light bulb moment...Drain tank, dig out an area of the gravel and then fill it with PF sand? Good enough?

Will cory eat pin-head size snails?

If I get between 5, and 8 cory, how many males and females? I'd like to be able to observe breeding behavior.

Thanks
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One more...will osmocote+ fert capsules under the gravel and or sand mess with cory health? It must leech into the water column at least in the case of gravel.
My Cory tank is pool filter sand over old gravel. I've never seen my cories eat a snail either.
My corys have not harmed any of my snails, they love sand to sift through. I would suggest using a name brand sand for them, simply because some of the stuff like black diamond sand can have sharp edges. Pool filter sand is usually pretty soft aswell.
I wouldn't worry about sexing the cories as you will likely be buying immature fishing making sexing not likely. If you go with 6 cories, you have a~99% chance of having 1 of each sex and you will more than likely end up with at least 2 or 3 of one sex.
Thanks for the replies! Much better than the deer-in-the-headlights look from the employee at the LFS. "You've got questions, we've got blank stares".

Can anyone advise if it's ok to put cory into an established 2 year old tank w/ 2 yrs of heavily-stocked-tank mulm beneath the gravel? I've only vacuumed lightly (weekly 50% changes) over the top of the gravel since flourite easily sucks up into the vacuum. My plants are in the way too. The water parameters have always been stable.
Thanks for the replies! Much better than the deer-in-the-headlights look from the employee at the LFS. "You've got questions, we've got blank stares".

Can anyone advise if it's ok to put cory into an established 2 year old tank w/ 2 yrs of heavily-stocked-tank mulm beneath the gravel? I've only vacuumed lightly (weekly 50% changes) over the top of the gravel since flourite easily sucks up into the vacuum. My plants are in the way too. The water parameters have always been stable.
Sounds fine to me
I would think you would have a higher chance of barbel damage with the gravel substrate plus not being able to remove mulm.
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