We have soft water and there's no way to get around it. So far I haven't worried about it but tonight I read that ghost shrimp need hard water for their skins to get hard. Snails too. Is there something I can add that will raise the hardness (I tested it with test strips-that's all I have-and it said it's soft) but will not raise ph? My ph is already high off the charts so I don't want to raise that.