You can add some limestone, shells or dead coral skeletons/ rubble to the tank or filter. Add a few small bits to start with and monitor the pH over a week and see how it goes. If the pH is still too low, add a couple more pieces and monitor the pH over another week. Continue doing this until the pH settles where you want it.Sure I can live without frogs but is there anyway I can increase the ph because I want platys and guppies definitely
The 3 squares for the GH are how you see what the level is. If you have 3 bluey green squares, that means there is less than 6dGH. 1dGH = 17.9ppm so your water is less than 110ppm and is soft.Not familiar with test strips, not sure why the GH requires 3 readings.
If the top square is pink and the bottom 2 squares are bluey green, the hardness is above 7dGH.
If the top 2 squares are pink and the bottom square is bluey green, the hardness is more than 14dGH.
If all 3 squares are pink, then the hardness is above 21dGH.
The pH is about 6.8 and the GH is below 110ppm.
Tetras, barbs, Corydoras catfish, loaches, angelfish and gouramis will be fine in this water. Kribensis will be fine too.
Depending on the tank dimensions (length x width x height), you could possibly keep a pair (1 male & 1 female) Kribensis in the tank. They are very easy to keep, and breed all the time. The big issue will be finding homes for the babies. There are other species in the Pelvicachromis genus that aren't as common as the Kribensis but are just as colourful and often more colourful. They are just as easy to keep and breed and because they aren't as common, you can sell more of them.
One of the nicest fish in the group is Pelvicachromis subocellatus from Moanda. they are a lovely fish and the female get a bright pink belly with a frost white edge around the pink. If you are interested in these fish, ask your local pet shop to order you in a pair consisting of a male and a female. Depending on the time of year, it might take a month or more to get them, but they are well worth the wait.
If you want guppies and platies, get a second tank and buffer the pH and GH with some Rift Lake water conditions designed for African Rift Lake cichlids.
If you are limited to space, get a double or even a triple tier stand and have 2 or 3 tanks on the same stand. Then you can have guppies and platies in one tank, and the other fishes in the second tank.