As title stated really......I've done some digging on the interwebs and seem to find that they are fine as long as they are in groups.
Anyone with experience of or good knowledge of to point me in the right direction? This is within a 210'ish litre tank btw.
Anyone with experience of or good knowledge of to point me in the right direction? This is within a 210'ish litre tank btw.

Well, anyways; not neon tetras; cardinal tetras are probably fine, though!! ^^;