Recommended Alge Turf Scrubber?

[VintageReefer]

Interesting. The much maligned sealab blocks. Hey what ever works. Can't argue with results.

The only negative flak they get is due to the false claim that they “automatically replenish trace and Ca as needed”

There is a bit of truth…a bit…behind the statement. It assumes trace is used in a proportion to Ca consumption. It’s a balanced mix of trace and Ca. It dissolves and as it releases Ca, it releases a proportionate amount of trace. It’s automatic! But it doesn’t “sense how much is needed” it does release consistently though