We can't really tell from just the strip without any scale to compare it to!
Do your strips include a test for ammonia? If they don't, you need to get an ammonia test kit as soon as possible; ammonia is the first toxin that can build up in an uncycled tank.
If you see
any positive result for ammonia or nitrite, you need to do an immediate, large, water change, making sure the new water is warmed and dechlorinated.
You will need to test at least once a day, maybe twice if either of those toxins rises very quickly, and be prepared for large water changes. There is
no safe level, of either of those two toxins; even a trace amount can make fish very sick, or even kill them.
One other point; do you know what species your 'sucker fish' is? There are hundreds of fish sold under that description and most of them are not suitable for a tank of that size. If you're not sure, post a picture and we can identify it for you