What type of plecos and syndontis cats are you trying. I currently are running 2 6"*2"*2" tanks with the first one containing two breeding pairs of oscars (Lemon or golden oscars not albino and red tiger pair). Hopefully i will have some young hatching in a days time, two pair of green severums, 2 sailfin plecos, a pair of port hoplo cats, And the full grown Siam Tiger. In tank 2 there is 1 silver arowana, 1 pearl arowana, 1 siam tiger, 2 upside downs, and two silver dollars. Tank 3 is 1.5 metres long 85 cm wide 60 cm high. It contains 2 pair of blue turq discus 10 other blue turq discus, a pair of dwarf flag cichlids, 4 snowball plecos, 1 gold nugget pleco, 1 zebra pleco, 2 bristle noses, 3 large clown loaches, 1 banded leporinus, 1 dwarf otto, and 6 panda corys ooops almost forgot the tetras a few lemon and neons. Tank 4 120 cm * 40 cm *45 cm contains 7 frontosa 3 duboisi 1 syndontis decorus (looking for amother 6 footer for these guys). Tank 5 is just a small 2 footer with 3 tiger barbs, 1 royal panaque, and the last fish is the six-barred distichodus, and thats about it.