red water bowl??

i went into my animal room to go give my gerbils and hamsters all a little bit of strawberry and noticed my gerbils water bowl is red? :( could this be blood or somehow from the food? i’m so confused and worried. my gerbs have a habit of dragging their food and bedding into their water bowl.

should i take them to the vet? :( i’m worried it’ll be expensive but if you all believe it would be the best option i’ll 100% do it