Yesterday I changed my substrate to sand in my 10 gallon tank. There is a pair of 2 - 3 inch sajicas and 3 guppies in there. They were both really stressed after I changed the substrate. This morning I checked on them and the male was fine. The female was still very stressed and staying in the upper corner of the tank. The male is also beating her. I don't know what to do. The only store that sold them in New Mexico went out of business so if she dies I cant just get another one. What should I do?