![]() Now to explain a couple other things in answer to your questions/comments in post #5. Will the store take these back? They should. This tank is too small for mollies (they grow to 4 and 5-6 inches), swordtail (they attain 4-5 inches), angelfish (6 inch body length with a vertical fin span of 8 inches), Conge Tetra (attain 3-4 inches and must have a group of six-plus). Obviously the guy in the shop is clueless about fish and tank sizes if he has suggested/approved all of these fish. Sorry, but you have got to remove some of these or they are not going to make it. If this is only a 60 liter (16 gallon) tank, there are way too9 many fish, and most of them are potentially too large for this tank. I have 2 guppies ( I did have about 8 but only 2 made it), 2 molly's, a single swordtail, a small angle fish, a single bistlenose, the 2 Congo and 11 Neon. I had a few issues getting started and a number of fish died, I bought the aquarium 2nd hand and have now upgraded the filtration so it is getting a lot of filtration now for 60 L tank, I was a bit worried about the flow rate and pointed the water circuiting back in at the tank wall, but the fish seem to love it and will often pop over to swim about directly where the flow is. Do you really think they will be stressed just the two of them, apart from that one incident they seem fairly well adjusted, occasionally darting about but mainly lounging amongst the plant life. ![]() I have had my two Congo's for a while now and were doing fine, but they were used to having most of the tank to themselves, maybe got a but stressed when all their new friends arrived. I wonder now if the Neon Tetra was just not in good shape and when I got it home from the shop it was already on it's last legs, as the others are all being left alone. Thanks all, the Congo's seem to have settled down now. Feeding is not likely the answer, as too much food (and it is easy to overfeed fish) means other negative issues with the fish and the system. But it also may be more an issue of a weak neon being grabbed. Having said that, and without knowing the tank size and other environmental info (aquascape, parameters, other fish), the neons may be so small they are targeted. ![]() ![]() Point is, the Congo don't seem interested in the fry, as I have observed fry as small as 1.3 cm swimming near the fully mature 4-inch Congos. I have Diamond Tetra in my tank with the group of Congos, and the Diamonds are prolific spawners I had 7 Diamonds when I added them to the tank last year, there are now just over 30 with the fry that have managed to survive. That means that the Congo may show their frustration by attacking a fish they otherwise would leave alone. Sometimes the opposite occurs, where an individual fish may become stressed to the point of withdrawing and slowly weakening to death. Scientific studies have now determined that stress usually causes increased aggression naturally aggressive fish become more aggressive, and normally peaceful fish become aggressive to some degree. Both of the above issues cause stress because the fish's expectations which are programmed into the DNA of the species are not being met. Congo tetra need a 4-foot tank, and must be in a group of at least 6 or 7, preferably a few more. Tank size is important obviously, but here again too small a space to suite the fish's natural behaviours and interactions can cause stress. I tend to go for 8-10 Congo, and more than this for the smaller tetras, provided the tank is large enough to accommodate them (I'll come back to tank size). I have not witnessed any of my Congo Tetras-and I have had a group now for four or more years, and many years ago had a group-even looking a small fish, but this likely has something to do with their environment.Ĭongo tetra, like neon tetra and any tetra species, is a shoaling fish it lives in groups of usually hundreds, so it must have a number of individuals in an aquarium.
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