Hello again,
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You may have seen my thread here where I talk about my apistos breeding>, which has been really wonderful. My tank is a 60L, and it is the minimum size you should consider, I say that with my current experience. Yes, some professional breeders use smaller tanks, but they are also changing all the water every day, feeding 6x a day, and have many extra tanks ready in case anything goes wrong. Why would you try to do it like a professional breeder? It will not be as nice an experience for you or the fish, but if you do it in a bigger tank it will be really enjoyable and beautiful, one of the highlights is when the fry are young, and the motherfish will travel with them around the tank in a cloud around her to feed - you need the size to experience this fascinating behaviour. You need the space partly for the parents, who must be able to get away from eachother (my female still killed my male the day before the babies came out from their cave, I didn't realise they had eggs even then), and for the babies - they aren't tiny fry forever and they have to get to a good size before you can give them to the LFS, spawns can be from 10 to 150 fry, they need a bigger tank so the water quality doesn't decline extremely quickly. My 30 fry are currently 1 - 3cm, and they use all of the tank all the time, I wouldn't want them in anything smaller. Even my 60l is pushing it, I do a lot more waterchanges to compensate.
When I first got my apistogramma, it was because my dad bought the pair for his 45l tank, which he read online was big enough. They were in there for 2 days, and it was clear the tank was too small for them to swim about as they wanted to, so he gave them to me. Give them the big tank and they will reward you with beautiful colouring and fascinating behaviour, why bother to keep and breed them if you aren't making them happy? I have just bought a tank 3x the size of my 60l so I can keep the apistos in there, I think that will be even more fascinating and make them even happier, apistogramma are clearly very intelligent fish and they need to be respected by you - they are relying on your to treat them well.
You seem to have a thing about putting fish in tanks which are too small - first you wanted discus in a 90cm, now you want apistos in a 17l. The apistos are simply too big, too intelligent and too active for this. Put them in the 90cm, if they start to look interested in breeding, buy a 60l. The 90cm is a perfect size for the apistogramma to really thrive. Stop thinking that just because a fish is small it can survive in a tiny tank, all fish need a good amount of space to thrive, even in large tanks they're in smaller spaces than they would be in the wild. Be generous with your fish, they deserve it!!