I'll try to take this one at a time...
Hi,
Not sure which Tetras to go with. LFS had both Neon and Cardinal Tetra fish plus one which looked nice, but who's name escapes me now. The Barbed fish are superb,we singled out the banded Barb (think it was the five banded type). The Guppys where flame tailed type or something but not sure ?
Neons are a little more sensitive about immature tanks. Cardinals grow a little bigger - and need a little more space for swimming. Not sure what the other tetra could be, like I said there is a myriad of options.
Are you sure they are five-banded? A very similar looking (and much more common) fish at a LFS is a tiger barb (four bands). Tigers are far more aggressive than five-banded. You need to be sure which you are looking at. Tigers can be fin nippers and are not suitable for certain other tankmates. Five banded barbs I have none heard of them nipping, but should still be kept in a proper shoal.
Guppies don't really matter which you get, they are all the same in terms of temperment, needs, etc. They just
look a little different is all.
LFS also said my tank water sample had a slightly high PH,but everything else was OK and not to worry as another water change later on next week or so will sort that out. They also recommended not putting any fish in yet, and complete the cycle properly before doing another water change. Another thing they talked about was plants,basically we dont have any at all apart from plastic stuff the kids bought themselves over the last month. LFS suggested planting a few now in my thick undergravel subtrate to help keep the Nitrate level secure or something ???
It is true that plants can help to keep nitrate levels down - they can also use ammonia from fish directly. The type of plants you get depends on the lighting you have on the tank. This is a question best posed to the folks in the planted section - they are experts. It sounds like you are going low-tech, no fertilizers, no carbon dosing, etc. But, even so, you need to know if your lighting is low, medium or high.
Oh yer one last thing regarding fish,is it safe to put ONE Japenese fighting fish into our tank,(not my choice btw ) ?
Over to you again.
Bettas are a tricky proposition. They are beautiful fish, but they are also very slow swimming, prefer low current and can be quite delicate with other fish - although they are generally hardy by themselves.
Guppies and bettas are a bad mix. The bettas don't like the flowing fins of the guppies and can kill them.
Bettas and most tetras can be a bad mix. Tetras can be fin nippers (as can many barbs, be careful of your selection here as well, see above notes on tigers versus five banded).
In general, unless you are CERTAIN that the betta will be sedate, and that the other fish will leave it alone, the addition of a betta is a bad choice. There are folks in the betta forum who can give you better recommendations on what will and won't work with a betta. The neons and cardinals should be fine. Depending on which other tetras you are looking at, it could be a disaster for the betta. And the guppies and betta just won't work - sorry. There have been successful cases, where the betta was very low-key, but those are the exceptions, not the rule. Bettas don't get along well with fish that have long flowing fins like themselves.