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I am redoing an established cichlid tank to house mainly plecos and I'm afraid I may have made a mistake in fish selection.

The tank:
20 gallon Long 30 ¼ in. x 12 ½ in. x 12 ¾ in.(77cm x 31.75cm x 32.3cm)
filtration is an Aquaclear50 HOB filter and an Eheim 2213 cannister
decor is black sand, java fern mounted on wood, large centerpiece of wood, and 3 caves.
current inhabitants: 4 micro raspboras and 2 nerite snails.

I have 8 juvenile plecos on the way, 4 each L340 (currently about 2" or 5cm) and 4 each Ancistrus cf. cirrhosis ''Bristlenose Pleco'' red marble (currently about 1" or 2cm).

My intention was to wait for pairs of each to form and rehome 2 of each species, leaving 4 in the tank. I don't plan on adding any other fish, save maybe a couple more micro raspboras.

I thought I had done my research, but now I'm beginning to think that their diets may not be compatible, and also perhaps that they might interbreed.

I apologize if I come across as someone doing something stupid, but if these fish can be housed together, any tips on feeding would be appreciated. Also, getting a larger tank as they grow is OK, but I tried to pick varieties that wouldn't get terribly big.

Thanks for your help!

I currently keep L340s and fire red BNs in the same tank with no issues. The BNs are mainly vegetarians, true, but they do like a little variety. My BNs also get NLS Thera +, along with their algae wafers, zucchini and the likes. The 340s are mainly carnivores but will also munch on the zucchini and wafers. I don't see an issue. On a side note, I have been looking to add to my 340 colony. I wonder if you would be willing to pass along where you got yours from ? Thanx and good luck.

Thanks for the reply!

I am getting them from Dave at http://www.davesfish.com/

My pleasure. And thank you.