The original parents of my fish belong to a friend of mine, he has been breeding Petricolas for Years, his have a concrete shipwreck and gravel in the tank, nothing else, they regularly deliver 1000 babies for him, and he now has at least 6 pairs that do that for him.
The parents were left to their own devices and kept the young in the shipwreck with them, sometimes they would have babies from prvious spawnings in with them when they produced a new lot, with no problems for the new batch.
So, onto mine, they are 3 years old and are in a juwel lido 120, originally the tank just had 2 resin caves in there for them, on gravel. The water is around 27/28C and in of a PH of 7, I know they come from an area which has PH of over 8, but this is the PH they were born into, and they seem to like it.
I added some giant straight Vallis for them, and they loved hanging around in it. When transferring the fish and plants to the 8 footer, I put all the smaller plants into the Petricolas' tank, they went a bit mental, swimming and playing in them, so when I had moved the plants to the 8 FT, the Cats looked a little down in the mouth, which led me to going out and buying £50 worth of plants for them, all happy again now!
Now, I have NO idea why they decided to spawn today, I did do a 50% water change, removed and cleaned all the plants and cleaned the filter this week, but it could simply be, that they have finally reached "that" age
I didn't take any pictures of the Spawning, as I have been busy taking delivery of a new sofa and getting rid of the old one, but the eggs are tiny anyway, about half the size of a Cory egg, so taking pics would be quite hard, they have been at it all day and it was at least 2 pairs, perhaps 3.
Funny thing with my Petricolas, they refused all types of food, including what they were raised on, until, out of desperation, I gave them Tetra Goldfish Flakes, they love 'em, weird
I have seen that Marble and bowl technique, very interesting, but I am going to leave them to their own devices, it's not like we know better than them, and their parents might have passed their expertise onto the ones I have. I will be removing the powerhead and putting an airstone into the Juwel filter and adding a sponge filter this week, just so any babies don't get minced up
Here is the only decent picture I got of the tank, you can see one of the cats clearly in the middle of the picture