SellFishes

14 comments

S ShrimpLord Oct 14, 2026 · 10:32 AM

220 is fine for neos, they handle 150 to 300 without trouble. Leave it. If you want to lower it, do it over a few water changes with plain RO, never a big swing, that's what causes bad molts.

B BrackishBabe Oct 14, 2026 · 11:13 AM

good point, I've been topping off with tap out of habit. switching that to RO today, thanks.

S ShrimpLord Oct 14, 2026 · 11:40 AM

Good call. Tap pushes the TDS up and swings the GH/KH, so topping off with RO only will keep it steady. Check TDS again in a couple of days.

B BrackishBabe Oct 14, 2026 · 11:45 AM

will do, I'll test after the next top off and report back. berried girls are still holding so fingers crossed.

S ShrimpLord Oct 14, 2026 · 12:23 PM

That's exactly what you want, slow and steady. Leave it alone and let the RO do the work.

DD Discus Dan Oct 14, 2026 · 1:32 PM

report back with the number brackishbabe, I switched to RO mix for my discus tank and the TDS settled after two weeks.

IB InkFin Bettas Oct 14, 2026 · 1:54 PM

same here with my betta RO mix, took about two weeks to stop drifting. brackishbabe a quick TDS number in a couple days would be handy for the rest of us.

B BrackishBabe Oct 14, 2026 · 1:57 PM

will do inkfin, testing after the next RO top off and I'll post the number here.

S ShrimpLord Oct 14, 2026 · 2:14 PM

205 is a great place to be. Keep topping off with RO only and it'll settle around there without you doing anything else.

B BrackishBabe Oct 14, 2026 · 2:43 PM

tested after this morning's RO top off and it read 205. girls are still carrying, will check again in a couple days.

RF Riverina Fish Co. Oct 14, 2026 · 3:43 PM

205 on remineralized RO sounds fine for neos honestly. mine sit around 200 and breed like crazy, just don't chase the number with big changes.

S ShrimpLord Oct 14, 2026 · 4:41 PM

riverina's right, 200 to 205 is fine for neos. the thing that kills them is swings, not the number.

B BrackishBabe Oct 14, 2026 · 4:42 PM

good to hear, no more tinkering from me then. girls are still carrying as of this afternoon.

S ShrimpLord Oct 14, 2026 · 7:11 PM

good call leaving it alone. check again after the next two top offs and if it stays near 205 you're done.

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