hi bro Venom
Welcome back... I just re-started myself.
1) 2 ft tank - no problem with 1 pair or even 1 male & 2 females
2) make sure got plenty of hiding places (e.g. plants, rocks, driftwood)
3) ph (depends on species) but I put mine at 6-6.5 & lower to 5-5.5 when conditioning fo breeding
4) filteration - if not many fishes, hang-on filter is OK
For your information, I am using the 1 ft GEX tank, put in a cave, 2 pieces of java fern (tied to wood), ada soil & airstone. I put a pair of apistos in each tank with 3 neon or glowlight tetras (as dither fishes). So far, no problem but still waiting for them to breed. Hopefully, with the slight change in weather, it will induce them to breed.
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