diff --git a/Cargo.lock b/Cargo.lock
index bc235ad2f..e38755cd7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -596,6 +596,8 @@ dependencies = [
  "serde_json",
  "slasher",
  "slog",
+ "slog-async",
+ "slog-term",
  "sloggers",
  "slot_clock",
  "smallvec",
diff --git a/beacon_node/beacon_chain/Cargo.toml b/beacon_node/beacon_chain/Cargo.toml
index a4182b773..26fdc0f5a 100644
--- a/beacon_node/beacon_chain/Cargo.toml
+++ b/beacon_node/beacon_chain/Cargo.toml
@@ -68,6 +68,8 @@ hex = "0.4.2"
 exit-future = "0.2.0"
 unused_port = {path = "../../common/unused_port"}
 oneshot_broadcast = { path = "../../common/oneshot_broadcast" }
+slog-term = "2.6.0"
+slog-async = "2.5.0"
 
 [[test]]
 name = "beacon_chain_tests"
diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 6696e15ee..a2dcdeefe 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -34,7 +34,9 @@ use rand::Rng;
 use rand::SeedableRng;
 use rayon::prelude::*;
 use sensitive_url::SensitiveUrl;
-use slog::Logger;
+use slog::{o, Drain, Logger};
+use slog_async::Async;
+use slog_term::{FullFormat, TermDecorator};
 use slot_clock::{SlotClock, SystemTimeSlotClock, TestingSlotClock};
 use state_processing::per_block_processing::compute_timestamp_at_slot;
 use state_processing::{
@@ -72,7 +74,6 @@ pub type DiskHarnessType<E, TSlotClock> = BaseHarnessType<E, LevelDB<E>, LevelDB
 
 pub type EphemeralHarnessType<E, TSlotClock> =
     BaseHarnessType<E, MemoryStore<E>, MemoryStore<E>, TSlotClock>;
-
 pub type EphemeralTestingSlotClockHarnessType<E> =
     BaseHarnessType<E, MemoryStore<E>, MemoryStore<E>, TestingSlotClock>;
 pub type EphemeralSystemTimeSlotClockHarnessType<E> =
@@ -2129,3 +2130,15 @@ impl<T: BeaconChainTypes> fmt::Debug for BeaconChainHarness<T> {
         write!(f, "BeaconChainHarness")
     }
 }
+
+pub fn build_log(level: slog::Level, enabled: bool) -> Logger {
+    let decorator = TermDecorator::new().build();
+    let drain = FullFormat::new(decorator).build().fuse();
+    let drain = Async::new(drain).build().fuse();
+
+    if enabled {
+        Logger::root(drain.filter_level(level).fuse(), o!())
+    } else {
+        Logger::root(drain.filter(|_| false).fuse(), o!())
+    }
+}
diff --git a/beacon_node/network/src/sync/range_sync/range.rs b/beacon_node/network/src/sync/range_sync/range.rs
index 8fde80cbc..afa42371b 100644
--- a/beacon_node/network/src/sync/range_sync/range.rs
+++ b/beacon_node/network/src/sync/range_sync/range.rs
@@ -377,25 +377,26 @@ mod tests {
     use crate::beacon_processor::WorkEvent as BeaconWorkEvent;
     use crate::service::RequestId;
     use crate::NetworkMessage;
-    use beacon_chain::{builder::BeaconChainBuilder, test_utils::test_spec};
     use beacon_chain::{
-        builder::Witness, eth1_chain::CachingEth1Backend, parking_lot::RwLock, EngineState,
+        builder::Witness,
+        eth1_chain::CachingEth1Backend,
+        parking_lot::RwLock,
+        test_utils::{
+            build_log, BeaconChainHarness, EphemeralSystemTimeSlotClockHarnessType as HarnessType,
+        },
+        EngineState,
     };
     use lighthouse_network::{
         rpc::{BlocksByRangeRequest, StatusMessage},
         NetworkGlobals, Request,
     };
-    use slog::{o, Drain};
-    use sloggers::{null::NullLoggerBuilder, Build};
-    use slot_clock::{SlotClock, SystemTimeSlotClock};
-    use std::time::{Duration, SystemTime};
+    use slog::o;
+    use slot_clock::SystemTimeSlotClock;
     use std::{collections::HashSet, sync::Arc};
     use store::MemoryStore;
     use tokio::sync::mpsc;
     use types::{Hash256, MinimalEthSpec as E};
 
-    const SLOT_DURATION_MILLIS: u64 = 400;
-
     #[derive(Debug)]
     struct FakeStorage {
         known_blocks: RwLock<HashSet<Hash256>>,
@@ -443,18 +444,6 @@ mod tests {
     type TestBeaconChainType =
         Witness<SystemTimeSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
 
-    fn build_log(level: slog::Level, enabled: bool) -> slog::Logger {
-        let decorator = slog_term::TermDecorator::new().build();
-        let drain = slog_term::FullFormat::new(decorator).build().fuse();
-        let drain = slog_async::Async::new(drain).build().fuse();
-
-        if enabled {
-            slog::Logger::root(drain.filter_level(level).fuse(), o!())
-        } else {
-            slog::Logger::root(drain.filter(|_| false).fuse(), o!())
-        }
-    }
-
     #[allow(unused)]
     struct TestRig {
         log: slog::Logger,
@@ -595,37 +584,16 @@ mod tests {
     }
 
     fn range(log_enabled: bool) -> (TestRig, RangeSync<TestBeaconChainType, FakeStorage>) {
-        let builder = NullLoggerBuilder;
-        let db_log = builder.build().expect("should build logger");
-        let store = store::HotColdDB::open_ephemeral(
-            store::StoreConfig::default(),
-            E::default_spec(),
-            db_log,
-        )
-        .unwrap();
-
-        // Initialise a new beacon chain
-        let chain = Arc::new(
-            BeaconChainBuilder::new(E)
-                .custom_spec(test_spec::<E>())
-                .store(Arc::new(store))
-                .dummy_eth1_backend()
-                .expect("should build dummy backend")
-                .slot_clock(SystemTimeSlotClock::new(
-                    types::Slot::new(0),
-                    Duration::from_secs(
-                        SystemTime::now()
-                            .duration_since(SystemTime::UNIX_EPOCH)
-                            .unwrap()
-                            .as_secs(),
-                    ),
-                    Duration::from_millis(SLOT_DURATION_MILLIS),
-                ))
-                .build()
-                .expect("should build"),
-        );
-
         let log = build_log(slog::Level::Trace, log_enabled);
+        // Initialise a new beacon chain
+        let harness = BeaconChainHarness::<HarnessType<E>>::builder(E::default())
+            .default_spec()
+            .logger(log.clone())
+            .deterministic_keypairs(1)
+            .fresh_ephemeral_store()
+            .build();
+        let chain = harness.chain;
+
         let fake_store = Arc::new(FakeStorage::default());
         let (beacon_processor_tx, beacon_processor_rx) = mpsc::channel(10);
         let range_sync = RangeSync::<TestBeaconChainType, FakeStorage>::new(