No salts are perfect and some salts are better than others. Reef crystals is a great low price mix. Tropic Marin maybe better but with your tank and your cost concerns it probably isn't worth it.
You can change 20 gallons of new salt you will be fine. And I dose manually and I usually miss the schedule. Lol
You can change 20 gallons of new salt you will be fine. And I dose manually and I usually miss the schedule. Lol



