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I have tried clear glass as a cave, and never had any plecos breed in them. Also all the crayfish ( marble self cloning ) that I have, bred without a cave.
 

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Dollar store sells these clear containers that you can use as "Caves".

I've used them. What I did was wrap them in plastic to make them dark.
I used left over background plastic to wrap the plastic.
Worked for me :)
You have to be careful about using random plastics with your fish. AFAIK the only fish safe plastics are:

PVC (Potable water PVC only)
PP (polypropylene)
PET/PETE (polyethylene)
PS (Polystyrene)
HDPE/LDPE (low/high density polyethylene)
Nylon

Almost all plastic containers have a stamp with either the type of plastic (ie, HDPE) or a number stamp (ie, 7). Look up the number stamp on your smartphone while you're in the store and see what kind of plastic it is. Plastics above 7 are "mixed" plastics and there's no way of knowing what they're using. Avoid those.
 

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Discussion Starter · #7 ·
Dollar store sells these clear containers that you can use as "Caves".

I've used them. What I did was wrap them in plastic to make them dark.
I used left over background plastic to wrap the plastic.
Worked for me :)
Did you mean the tupperware? Or other types of clear containers?

You have to be careful about using random plastics with your fish. AFAIK the only fish safe plastics are:

PVC (Potable water PVC only)
PP (polypropylene)
PET/PETE (polyethylene)
PS (Polystyrene)
HDPE/LDPE (low/high density polyethylene)
Nylon

Almost all plastic containers have a stamp with either the type of plastic (ie, HDPE) or a number stamp (ie, 7). Look up the number stamp on your smartphone while you're in the store and see what kind of plastic it is. Plastics above 7 are "mixed" plastics and there's no way of knowing what they're using. Avoid those.
Just to confirm, HDPE is the recycle symbol with a number in it?
 

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Just to confirm, HDPE is the recycle symbol with a number in it?

All plastics have a recyle symbol with a number in it. HDPE is #2. All the plastics have a different #. They're all on Wikipedia.
 

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I have tried clear glass as a cave, and never had any plecos breed in them. Also all the crayfish ( marble self cloning ) that I have, bred without a cave.
My plecos and kribensis breed in transparent glass bottles. However, I believe that they will use dark caved/bottles readily.
 
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