Hi gwynnie, and welcome to Tropical Fish Keeping forum.
I moved your post out of the existing thread and started a new one for you. More members will see it on its own, and be able to offer advice.
Cycling takes time, and the best way to explain it is to refer you to this article by another of our members: http://www.tropicalfishkeeping.com/f...m-cycle-38617/
With fish in the tank, you must keep ammonia and nitrite near zero during cycling. Water changes (half the tank volume) every day or alternate days may be necessary. It is best to use a conditioner that detoxifies ammonia and nitrite; Prime and Ultimate are two that do this. If you use either, you can get away with alternate day water changes, until both ammonia and nitrite are zero.
You mention guppy. Livebearers (guppy, molly, platy, swordtail, and a few rarer species) need medium hard water and a pH above 7 or they will weaken. Your pH at 6.5 likely weakened the fish, plus the cycling issues. Before getting more fish, and after the cycling is complete, we should look at your tap water parameters, namely hardness and pH.
The clown loach is a soft water fish preferring a pH around 6.5 so that is fine for him. The cycling is likely affecting them, loaches are highly sensitive fish to water problems.
Do you have any live plants? These help in cycling, esp floating plants.