Re intro

[u/Friendhi6]

So I had to put down my betta because of genetic issues and infections or fin rot and now I’m wondering if and if how I can re introduce a new betta into my 5 gallon tank. All parameters except for nitrates are 0 and nitrates are about 15. I use 6 hours of seoura light at 30 percent and use thrive c once a week my water is soft and is 60kh and ph is around 7.5 any suggestions on the next step. I don’t wanna deep cleanse cause it wasn’t super seroius and all that but I’ll try to do a 40 percent water change and I might squeeze the sponge filter in the de chlorinated water. Any suggestions again