Description
TMC Optical Auto Top Up System
Maintain a stable water level in your aquarium with the TMC Optical Auto Top Up (ATO) System. Designed for accuracy and reliability, this intelligent device uses optical sensors to automatically detect water levels and top up evaporation loss, helping keep your salinity and water parameters consistent in marine and reef setups.
Features & Benefits:
- Optical sensor technology – highly accurate water level detection with minimal failure risk
- Automatic top-up – replaces evaporated water to maintain stable salinity
- Prevents salinity swings – essential for reef and marine aquarium stability
- Compact & easy to install – suitable for most sump or tank setups
- Reliable performance – reduces daily maintenance and manual topping up
Care & Usage Tips:
- Use with RO/DI water only for topping up
- Position sensor in a stable, low-splash area of the sump or tank
- Regularly clean the sensor to ensure accuracy
- Ensure reservoir is topped up to avoid dry running
Specifications:
- Suitable for: Marine and reef aquariums
- Sensor type: Optical
- Function: Automatic evaporation top-up system
- Installation: Sump or aquarium edge mounting
Keep your reef stable and stress-free with the TMC Optical Auto Top Up System – a must-have for maintaining consistent water conditions with minimal effort.
Click & Collect
Livestock will only be bagged once you arrive, or if you contact us in advance to request it ready beforehand.
Local Delivery
Order anything from our in-store range and have it delivered right to you.
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Minimum spend: £50
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Delivery from £15 - £30
- Range 0-25 miles from store
Distances are measured “as the crow flies”, not by road.
Once your order is placed, we’ll be in touch to arrange a suitable delivery date and time.
Please note, delivery may take a little longer as we often group orders together to build an efficient delivery run.
Important: If you’re ordering a large aquarium, please ensure someone is available to help unload the van on arrival.
Dry Goods Delivery
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DX Express: 1 working day, same-day dispatch before noon 0-75kg
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Express Pallet: 1–3 working days 75-500kg
If you'd like to add more items to an existing order that hasn't yet been dispatched, please place a Click & Collect order and leave a note asking us to combine the orders.
Please note: We currently only dispatch parcels Wednesday to Friday.
Pre-Order
Want the full details? Check out our Terms & Conditions.
Livestock Delivery
Thursday Delivery – £24
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Dispatched Wednesday afternoon
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Delivered Thursday before 1pm
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Order by Wednesday 12 noon
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Minimum spend: £50
Friday Delivery – £24
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Dispatched Thursday afternoon
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Delivered Friday before 1pm
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Order by Thursday 12 noon
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Minimum spend: £50
Saturday Delivery – £29
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Dispatched Friday afternoon
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Delivered Saturday before 1pm
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Order by Friday 12 noon
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Minimum spend: £50
📦 Want to Add to an Existing Order?
No problem! Just place a Click & Collect order and leave a note asking us to link it with your original one (as long as it hasn’t been dispatched yet).
🛒 Dry Goods Now Included!
You can now include dry goods in your livestock delivery – perfect for topping up supplies in one go.
❄️ Please note: We can’t send frozen food with livestock – please order frozen items separately.
⚠️ Delivery Exclusions
Unfortunately, we’re unable to deliver livestock to the following postcodes:
Scotland & Isles:
AB30–AB56, DD8–DD10, DG3–DG9, DG12–DG14, FK17–FK21, KA18–KA19, KA26–KA30, PA20–PA38, PA80, PH3–PH40
Cornwall Isles: TR21–TR25
All of the following postcodes are excluded:
BT, HS, IM, IV, JE, KW
Plus Channel Islands and Shetland Islands
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.