Thank you. I'll make sure that I do regular water change. Is my fish load and plant load ok. I feed my fish twice a day with flakes will be stating frozen bloodworms once/twice a week soon. I live in south East England Kent.
Thanks.
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Sometimes I hate this question, or similar. I get so tired of having to tell someone "well..." when it is not exactly "good" news.
Some of the fish you have are shoaling fish, meaning they live in large groups of hundreds, and they need several of their own species in the aquarium. The tetras and cories are shoaling (platys are not). Nathan Hill happened to author an article in PFK that I saw earlier today, and will cite from as he says it well:
Having shoals that are too small
Some fish are destined to do badly by virtue of being constantly nervous. Shoaling fish are gregarious by nature, and their whole life cycle may depend on their interactions with others.
In the wild, barbs and tetras may live in shoals of hundreds at a time. In those shoals will be complex hierarchies, social ties and breeding opportunities. When kept as three individuals in a tank, all of this innate social programming is redundant.
That could mean shy fish, hidden away, refusing to eat and slowly starving. Or in the case of others it may lead to fin nipping, as fish try to interact with different species as they would their own kind.
Always buy as many of one kind of shoaling fish as you can afford or accommodate. Mixed shoals, and the pick-and-mix option might be great for bags of Haribo, but this approach won’t work with sensitive animals.
Aquarists, especially those starting out, will ask "how many?" by which of course they mean the minimum for the good of the fish. Five or six is usually considered the absolute minimum.
Space is obviously minimal for this. To go out on a limb, for the sake of the fish, if this were me and I had no options (meaning, other or larger tanks) I would get another 2-3 cories, and another 3-4 of each of the tetra species. Live plants help you--especially those floating plants (in more ways than this)--and regular partial water changes. Feed minimally, once a day is sufficient, and not much. Each of these fish only needs a flake or two for nutritional needs daily. The corys must have sinking foods, like shrimp tablets, Veggie Rounds. Frozen bloodworms as a treat, only once a week (this is not a good food more often).
Byron.
